Adam with the Soul Gem was afraid of going into Thanos' mind.
Moondragon wasn't even able to do that.
Martian penetrate Spectre, and Thanos almost defeated Galactus in astral plane.
Thanos took punches from Drax and WM PG Thor, he also survived in a black hole.
Odin wasn't able to down Thanos in one attack during their battle against each other.
Besting Thanos's force fields caused Galactus to get hungry immediately.