herculean

adjective

1. requiring the great strength of a Hercules; very hard to perform: Digging the tunnel was a herculean task.
2. having enormous strength, courage, or size.
3. (initial capital letter) of or relating to Hercules or his labors.

adjective

1. requiring tremendous effort, strength, etca herculean task
2. (sometimes capital) resembling Hercules in strength, courage, etc