requiring tremendous effort, strength, etc: a herculean task - (sometimes capital)
resembling Hercules in strength, courage, etc
WordReference Random House Learner's Dictionary of American English © 2025
her•cu•le•an /ˌhɜrkyəˈliən, hɜrˈkyuli-/USA pronunciation
adj.
WordReference Random House Unabridged Dictionary of American English © 2025- requiring great strength:a herculean task.
her•cu•le•an
(hûr′kyə lē′ən, hûr kyo̅o̅′lē ən),USA pronunciation adj.
- requiring the great strength of a Hercules;
very hard to perform:Digging the tunnel was a herculean task. - having enormous strength, courage, or size.
- Mythology(cap.) of or pertaining to Hercules or his labors.
- Latin Hercule(us) of, belonging to Hercules + -an
- 1590–1600
- 1.See corresponding entry in Unabridged prodigious, arduous, onerous, formidable.
Collins Concise English Dictionary © HarperCollins Publishers::
'herculean' also found in these entries (note: many are not synonyms or translations):