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Herculean

adjective
 
 
/ˌhɜː.kjʊˈliː.ən/ US  /ˌhɝː-/

Definition

needing great strength and determination: a Herculean effort She faces the Herculean task of bringing up four children single-handedly.Complicated and difficult to doDifficult to understand
(Definition of Herculean adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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