Etymology
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Herculean (adj.)

1590s, from Hercules + -an. "Of enormous size or strength or great courage," also sometimes "very difficult or dangerous," in allusion to the hero's labors.

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Definitions of Herculean

herculean (adj.)
displaying superhuman strength or power;
herculean exertions
Synonyms: powerful
herculean (adj.)
extremely difficult; requiring the strength of a Hercules;
a herculean task
From wordnet.princeton.edu