American English

Definition of Herculean adjective from the Oxford Advanced American Dictionary

 

Herculean

 adjective
adjective
NAmE//ˌhərkyəˈliən//
 
, NAmE//hərˈkyuliən//
 
[usually before noun]
 
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needing a lot of strength, determination, or effort a Herculean task From the Greek myth in which Hercules proved his courage and strength by completing twelve very difficult tasks (called the Labors of Hercules).
See the Oxford Advanced Learner's Dictionary entry: Herculean