List of Abilities Unaffected by Tenacity
Tenacity- this stat reduces the time a champion is affected by crowd control
The types of crowd control that ignore Tenacity are:
- suppression
- knockups and other forms of displacements
- forced stasis
Note: Tenacity does not affect the strength of a slow but just the duration of the slow
Here's a list of champions with irreducible cc as well as a quick look at the abilities which ignore tenacity as of 2/25/2018 on patch 8.4.
Note: This list ignores non-champion displacements such as
passive against minions and monsters.
Legend: Champion portrait. Ability name (type of cc. ultimate or non-ultimate ability. base cooldown of this ability without cooldown reduction. skillshot ability/self cast ability/targeted ability. area of effect (aoe) or single target crowd control. data on the duration of the knockup or suppression, the distance of the knockback, etc.)
Dark Flight (knockup. non-ultimate. 13-11 second cd. skillshot. aoe. 1 second duration)
Crystallize (knockback. non-ultimate. 17 second cd. skillshot. aoe. knockback distance depends on how close the target was to the center of the wall)
Pulvarize (knockup. non-ultimate.17-13 second cd. self-cast. aoe. 1 second duration) Headbutt (knockback. non-ultimate. 14-10 second cd. targeted. single target. 650 units)
Voice of Light (knockback. ultimate. 110-70 second cd. skillshot. aoe. knockback distance varies between the affected units and Aurelion Sol's Outer Limit)
Emperor's Divide (knockback. ultimate. 120-90 second cd. skillshot. aoe. knockback distance is unspecified)
Tempered Fate (forced stasis. ultimate. 130-90 second cd. skillshot. aoe. 2.5 seconds)
Rocket Grab (pull. non-ultimate. 20-16 second cd. skillshot. single target. pull distance varies between the target and Blitzcrank but the range of Rocket Grab is listed as 925 units) Power Fist (knockup. non-ultimate. 9-5 second cd. self cast/targeted. single target. 1 second duration)
Glacial Fissure (knockup. ultimate. 140-100 second cd. skillshot. aoe. all enemies close to Braum are knocked up for 1-1.5 seconds or the first enemy champion hit will be knocked up for this duration regardless of distance to Braum. All other enemies will be knocked up for 0.25 seconds)
Hextech Ultimatum (knockback. ultimate. 140-90 second cd. targeted. aoe. knockback distance is unspecified as the knockback depends on the proximity of a champion to Camille's targeted champion and the perimiter of her ultimate)
Rupture (knockup. non-ultimate. 9 second cd. skillshot. aoe. 1 second duration)
Special Delivery (knock aside. non-ultimate. 240 seconds. skillshot. aoe. knockback depends on the distance between the champion and the center of Special Delivery)
Apprehend (pull. non-ultimate. 24-12 second cd. skillshot. aoe. pull distance varies between Darius and his target. pull range is 535 units)
Moonfall (pull. non-ultimate. 26-18 second cd. self-cast. aoe. pulls enemies up to 225 units)
Stand Aside (knock aside. non-ultimate. 18-14 second cd. skillshot. aoe. unspecified knockback distance)
Chum the Waters (knockup/knockback. ultimate. 100-70 second cd. skillshot. aoe. An enemy champion directly hit by the skillshot will be knocked up for 1 second while any enemy champions not directly hit by the ability will be knocked backed 150/250/350 units based on the travel distance)
Justice Punch (knockup. non-ultimate. 12-8 second cd. skillshot. aoe. 0.75 second duration) Hero's Entrance (knockup. ultimate. 180-120 second cd. targeted. aoe. knocks up enemies within the zone for 0.75 seconds but enemies at the center of the zone are knocked up for 1.25 seconds)
GNAR! (knockback. ultimate. 120-80 second cd. skillshot. aoe. 590 units)
Bodyslam (knockback. non-ultimate. 16-12 second cd. skillshot. aoe. knockback distance unspecifiied) Explosive Cask (knockback. ultimate. 120-80 second cd. skillshot. aoe. enemies are knocked back 600 units from the epicenter of the explosion)
Devastating Charge (knockback. non-ultimate. 24-16 second cd. skillshot. aoe. knockback is 250-450 units based on how far Hecarim has traveled)
Daisy! (knockup. ultimate. 160-120 second cd. targeted. aoe. 1 second duration)
Howling Gale (knockup. non-ultimate. 12 second cd. skillshot. aoe. knockup duration varies between 0.5 and 1.25 seconds based on charge time) Monsoon (knockback. ultimate. 150-120 second cd. self-cast. aoe. knockback varies based on the distance between Janna and the range of Monsoon. Monsoon's effect radius is 725 units)
Dragon Strike/Damacian Standard (knockup. non-ultimate. 10-6/13-11 second cooldowns. skillshot. aoe. 0.75 second duration)
Thundering Blow (knockback. non-ultimate. 20-10 second cd. targeted. single target. 260-500 units based on Jayce's distance to his target)
Fate's Call (knockup. ultimate. 150-90 second cd. skillshot. aoe. 1.5/1.75/2 second duration)
(Rhaast form) Blade's Reach (knockup. non-ultimate. 13-9 second cd. skillshot. aoe. 1 second duration)
Beartrap on a Rope (pull. non-ultimate. 9-7 second cd. skillshot. single target. 100 units) Chaaaaaaaarge!!! (knockback. ultimate. 160-120 second cd. targeted. single target. 100 units)
Dragon's Rage (knockback/knockup. ultimate. 110-60 second cd. targeted. aoe. the targeted enemy is knocked back 1200 units while any enemies colliding with the enemy-turned-projectile are knocked up for 1 second)
Wild Growth (knockup. ultimate. 110-80 second cd. targeted. aoe. 0.75 second duration)
Unstoppable Force (knockup. ultimate. 130-100 second cd. skillshot. aoe. 1.5 second duration)
Nether Grasp (suppression. ultimate. 140-80 second cd. targeted. single target. 2.5 second duration)
Bramble Smash (knockback. non-ultimate. 8-5 second cd. skillshot. aoe. up to 300 units based on proximity)
Tidal Wave (knockup. ultimate. 120-100 second cd. skillshot. aoe. 0.5 second duration)
Dredge Line (pull. non-ultimate. 18-10 second cd. skillshot. single target. highly variable pull distance as Nautilus also pulls himself toward the target. Range of the skill is 1100 units) Depth Charge (knockup. ultimate. 120-80 second cd. point and click. aoe. 1 second duration)
Command: Shockwave (pull. ultimate. 110-80 second cd. skillshot/self-cast. aoe. 350 units)
Volcanic Rupture (knockback. non-ultimate. 9-7 second cd. skillshot. aoe. undefined knockback distance but should vary based on proximity to the center of the spawning pillar) Searing Charge (knockup. non-ultimate. 16-12 second cd. skillshot. aoe. 1 second duration) Call of the Forge God (knockup. ultimate. 140-100 second cd. skillshot. aoe. 1.5 second duration)
Heroic Charge (knockback. non-ultimate. 14-10 second cd. targeted. single target. up to 300 units) Keeper's Verdict (knockup/knockback. ultimate. 140-100 second cd. skillshot. aoe. knockup is 1 second if not charged. knockback has a huge amount of variation depending on charge time. full charge knockback distance is listed as "an incredible distance" on the wiki)
Vault (knockback. non-ultimate. 12-8 second cd.targeted. single target. undefined but small distance)
Grand Entrance (knockup. non-ultimate. 18-12 second cd. skillshot. aoe. 1 second duration)
Powerball (knockback. non-ultimate. 16-6 second cd. skillshot. aoe. 100 units)
Unburrow (knockup. non-ultimate. 4 second cd. skillshot. single target. 1 second duration)
Broken Wings (knockup. non-ultimate. 16 second cd. skillshot. aoe. unspecified duration)
Arctic Assult (knockup. non-ultimate. 17-11 second cd. skillshot. single target. 0.5 second duration)
Dragon's Descent (knockback. ultimate. 150-50 second effective cd. aoe. unspecified distance)
Fling (Pull. non-ultimate. 10 second cd. targeted. single target. 550 units)
Decimating Smash. non-ultimate. 10-6 second cd. skillshot. aoe. 1.25-2.25 second durartion) Unstoppable Onslaught (pull. ultimate. 140-60 second cd. skillshot. aoe. unspecified distance)
Impale (suppression/pull. ultimate. 120-80 second cd. targeted. single target. suppression duration is 1.75 seconds but pull distance varies based on Skarner's movespeed)
Scatter the Weak (knockback. non-ultimate. 16-12 second cd. skillshot. aoe. unspecified distance)
Devour (suppression/displacement. non-ultimate. 14-10 second cd. targeted. single target. suppression duration is 2-3 seconds. Tahm may carry a suppressed target a short distance that varies based on his movement speed)
Seismic Shove (knockup/knock aside. non-ultimate. 16-12 second cd. skillshot. aoe. knockup duration is 1 second. distance is unspecified) Weaver's Wall (knock aside. ultimate. 180-120 second cd. skillshot. aoe. knocked distance varies based on proximity to the wall)
Death Sentence (pull. non-ultimate. 20-12 second cd. skillshot. single target. pull distance is unspecified and varies based on the amount of tugs Thresh performs) Flay (knockback/pull. non-ultimate. 9 second cd. skillshot. aoe. pull distance is unspecified)
Buster Shot (knockback. ultimate. 120-100 second cd. targeted. aoe. knockback distance is unspecified)
Pillar of Ice (knockback. non-ultimate. 22-14 second cd. skillshot. aoe. 225 units)
Disdain (pull. non-ultimate. 16-12 second cd. skillshot. single target. fling distance is unspecified) Fear Beyond Death (suppression/pull. ultimate. 120-70 second cd. skillshot. single target. suppression lasts 1.5 seconds. pull distance varies greatly based on distance between Urgot and his target) *Unlike other forms of suppression, Urgot's suppression cannot be interrupted by hitting Urgot with crowd control. Only killing him can cancel the effect.
Condemn (knockback. non-ultimate. 20-12 second cd. targeted. single target. 575 units)
Tectonic Disruption (knockback. non-ultimate. 16-12 second cd. skillshot. aoe. knockback distance is unspecified)
Vault Breaker (knockback/pull. non-ultimate. 16-8 second cd. skillshot. aoe. knockback and pull distances are unspecified) Assault and Battery (knock aside/knockup. ultimate. 130-70 second cd. targeted. aoe . knock aside distance is unspecified. knockup duration is 1.25 seconds)
Gravity Field (with AUGMENT:IMPLOSION) (pull. non-ultimate. 17-13 second cd. skillshot. aoe. pull distance is unspecified as the distance varies based on the enemy champion's proximity to the center of the Gravity Field)
Rolling Thunder (pull. non-ultimate. 12-8 second cd. targeted. single target. pull distance is unspecified)
Infinite Duress (suppression. ultimate. 110-70 second cd. skillshot. single target. 1.5 second duration)
Cyclone (knockup. ultimate. 120-90 second cd. skillshot. aoe. 1 second duration)
Three Talon Strike (knockup. non-ultimate. 9-5 second cd. targeted. single target. 0.75 seconds) Crescent Guard (knockback. ultimate. 120-100 second cd. point and click. self-cast. aoe. knockback distance is unspecified as it varies based on the distance between Xin Zhao and the edge of the ability)
Steel Tempest (knockup. non-ultimate. cd depends on number of casts necessary to generate 3 stacks as well as bonus attack speed. skillshot. aoe. 1 second knockup duration)
Stretching Strikes (knockback/pull. non-ultimate. 13-9 second cd. skillshot. single target. pull range depends on the distance between the two targets) Let's Bounce! (knockback/carry. ultimate. 130-100 second cd. self cast/skillshot. aoe. without charging this ability enemies will be knocked back 275 units over 1 second. if the ability is charged for at least one second Zac may carry nearby enemies toward a target location. the carry distance depends on the player. maximum carry distance is unspecified)
Satchel Charge (knockback. non-ultimate. 26-12 second cd. skillshot. aoe. 250 units)
Stranglethorns (knockup. ultimate. 130-110 second cd. skillshot. aoe. 1 second duration)
Note:
's Brittle reduces tenacity by 30/60% based on stacks of Brittle. Brittle can put a champion's tenacity stat in the negatives granting even knockup effects up to an additional 30/60% duration.
Number of abilities irreducible by Tenacity: 82
Total number of champions who have abilities irreducible by cc: 63
Number of champions with suppression: 5:

Number of champions with knockups/displacements (not counting ones that only affect non-champions): 59:
(Rhaast form only)
(after evolving Gravity Field)

Number of champions with forced stasis: 1: 
Number of champions with 2 separate abilities that are irreducible by Tenacity: 12:

Number of champions with 3 separate abilities that are irreducible by Tenacity: 1: 
Number of ranged champions who have abilities with irreducible cc: 23:

Number of melee champions who have abilities with irreducible cc: 37:

Number of hybrid ranged/melee champions who have abilities with irreducible cc: 3:

Feel free to use this data to discuss the issue.
Her charm
His Q and his R
Technically she only has 1 stun
Her innate slow, W slow, and ultimate stun
He has a stun on his Q
I believe tenacity works on her traps and she has a slow on her E
She has a slowing effect on her W and her ultimate is a stun
Q slows you
Q slows you, W stuns you
Cocoon stun
Charm
Fear and silence
Technically has a stun
Slow on his barrels
Silence on his Q
Stun on his grenade
Slow on her E when proc'd
Stun
Stun
Slow and root plus I believe his ult slows you
Slow and root
Slow and root
His wall slows
I believe his W or E slows- whichever the cone is
Q slows
Stuns
Slow on his W
Slow on his E
Root on her chains and I believe her W slows
Stun, root, and stun again
Root and a slow and her ult is a stun
Snare and slow
Slow
Haha you thought Morde actually had CC for a second
Root plus stun
Movement speed slow and attack speed slow
Fear
Slow on his balls and slow on his ice
Slow on his Q
Stun on his W and I believe his ult slows you
Stun
Slow and/or root on his bola
Slow on his harpoons and his ult, I believe when overheated his AAs slow too
Roots with the cage
Fear on his box and his E slows I believe
Taunt on his E and his Q slows if it goes through you
Has a slow with an empowered E, also the ult dance
Slows on the Q, silence/root on the E
Reworked and haven't played as yet but his W is CC of some kind
Has a slow in his W
Stun on his E
Blind on his Q, slow on his shrooms
Slow on his shout
Stun/Slow depending on his cards
Slow on his W
Stun on his E
Slow on his E, snare on his ult
Stun is the wall
Root based on her feathers
Stun and slow
Slow on his E
E slows
Slows your movement and attack speed, also stuns
I believe this works on her bubble
and now 