Fans have speculated that Hulk's unwillingness to fight is because he's scared of losing to Thanos again, but the writers and directors behind Infinity War have denounced such speculation. Turns out Hulk isn't scared; he's angry. Spoilers for Infinity War follow. Want us to remember this setting for all your devices?
After Avengers: Infinity War, some people thought Hulk feared Thanos, but the real person he fears is one he can never truly defeat. In Avengers: Infinity War, the Hulk proved that he couldn't take on every threat in the Marvel Universe.
While he might have been able to defeat him, the Hulk could inflict some serious damage to Thanos and could conceivably kill him if given the chance. That threat to his life would be a completely unnecessary risk for Thanos to take without the absolute power of the Infinity Stones.
That if he does come out, he's going to cause a lot of destruction and they'll hate him even more. For example, in Avengers: Age Of Ultron, after the 'Hulk Buster vs Hulk' fight, Hulk sees how people are fleeing away from the hulk/the destruction that he caused.
Not to go too far down the rabbit hole of pop psychology, but what Hulk and Banner are most afraid of is losing themselves to one another. Banner is afraid of what will happen if he Hulks out, his anger takes over, and he can't regain control.
Abomination – Emil Blonsky. A gamma-spawned monstrous powerhouse. The Hulk's primary physical rival.
Apocalypse. Apocalypse makes his way into this position on the list because he is technically stronger than the Hulk. He also has a multitude of other abilities, including telepathy, telekinesis, and shapeshifting.
According to the Watcher, the reason for the Hulk's rage is the fact Bruce Banner's persona lies buried within him, desperate to communicate, eager to escape, yet forever imprisoned.
With an incredible healing factor, He's almost invulnerable, and there are plenty of occasions in which it was said that The Hulk was immortal.
Hulk hates Banner because he's puny. The Hulk takes pride in his power and the freedom it gives him. He sees Banner as a waste because being Banner takes away from his life. He also knows that Banner would destroy him if he could.
As per the user, the director of Avengers confirmed that Thanos was most scared of Iron Man. “Not because of his strength, not because of his power, not because of his power, but because of his suit,” he added.
The polished fighting style of Thanos proved too much for Hulk and his overall brutality and savagery. Hulk had the upper hand for all of two seconds due to the element of surprise before Thanos was able to finish the fight with a few quick blows.
Bruce Banner's deepest fear since becoming the Hulk is losing control of his emotions, which has been evident in his transformation into his bloodthirsty alter-ego, Kluh, in the AXIS storyline. Kluh's extreme ferocity even alarmed the Hulk himself, a testament to the danger he poses.
Why was Hulk so weak in Infinity war? Because the writters wanted to Show all the version of Hulk in Avengers series,Marvel took that step and showed Hulk weak in Infinity war so that the final versionof Hulk that is professor Hulk could have been shown.
Thanos defeated Hulk at the beginning of Avengers: Infinity War. He was able to do so because he is about as strong as, and more intelligent than, the Hulk.
The Time Heist in Avengers: Endgame allowed the surviving heroes to get the Infinity Stones and with the help of a Nano Gauntlet developed by Tony Stark, Bruce Banner, and Rocket Raccoon, Smart Hulk undid Thanos' snap.
Vibranium can also cut the Hulk due to the same reasoning as Adamantium -- they are two of the strongest metals in the world. The one thing to note is that when Hulk gets angrier, his skin becomes more durable and can then withstand even these metals.
Blonsky sought out and battled the Hulk to prove his superiority. Betty Ross called him an “abomination,” and Blonsky approved of that descriptor enough to take it as his name. The Abomination soundly defeated the Hulk in their first encounter, leaving him near death.
The Avengers found that a certain lullaby, typically said by the Black Widow, was able to calm the Hulk and help him revert back to Banner, when the Hulk's strength was no longer needed.
HE CAN BREATHE UNDERWATER
The Hulk has a rather unknown ability in breathing underwater, which he's able to accomplish due to a gland in his body that creates oxygen to fill his lungs with.
Whether it was magic-wielding sorcerers like Doctor Strange or entire teams like The Avengers, almost nothing can get in Hulk's way when he's on a rampage. Though he has beaten the best of the best, only his biggest victories left readers stunned at the sheer power of Bruce Banner's alter ego.
Thor is stronger than the Hulk
Now, with everything even, the two had one more fight. Unfortunately for Bruce Banner, he learned a lesson. The God of Thunder has always held back. Beta Ray Bill tells Sif that every time they fought, the Odinson held back because he saw someone worth saving and showed him mercy.