In battle Odin has lost to Galactus before: although he gave it his all and shattered Galactus’ skull, the devourer didn’t feel much, while Odin went into the Odinsleep.

An Odinforce-empowered Thor, although he did better, still got beaten by Galactus. To add insult to injury in this instance and the instance before Galactus was hungry.

Things didn’t go well for the gods.