Wiktionary
behemothic
a. colossal, of enormous size and power.
Usage examples of "behemothic".
Setting up the logistics in Bogon for the feeding of eleven to twelve thousand men, plus a thousand horses and eighty behemothic eating machines called battledragons was a colossal task.
Clay, a behemothic damsel of some fifty summers, with a face like a desiccated pudding.
Oozing and surging up out of that yawning trap-door in the Cyclopean crypt I had glimpsed such an unbelievable behemothic monstrosity that I could not doubt the power of its original to kill with its mere sight.