English

Definition of Herculean adjective from the Oxford Advanced Learner's Dictionary

 

Herculean

 adjective
adjective
BrE BrE//ˌhɜːkjuˈliːən//
 
; NAmE NAmE//ˌhɜːrkjuˈliːən//
 
[usually before noun]
 
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needing a lot of strength, determination or effort a Herculean task More Like This Expressions from history and legend Achilles heel, Cinderella, Herculean, Mephistophelian, Midas touch, narcissism, odyssey, Prince Charming, Procrustean, Promethean, Pyrrhic, Robin Hood, Scylla and Charybdis, Sleeping Beauty, Stygian, TitanSee worksheet. From the Greek myth in which Hercules proved his courage and strength by completing twelve very difficult tasks (called the Labours of Hercules).
See the Oxford Advanced American Dictionary entry: Herculean