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herculean

[hur-kyuh-lee-uh n, hur-kyoo-lee-uh n]
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adjective
  1. requiring the great strength of a Hercules; very hard to perform: Digging the tunnel was a herculean task.
  2. having enormous strength, courage, or size.
  3. (initial capital letter) of or relating to Hercules or his labors.
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Origin of herculean

1590–1600; < Latin Hercule(us) of, belonging to Hercules + -an

Synonyms

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1. prodigious, arduous, onerous, formidable.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for herculean

herculean

adjective
  1. requiring tremendous effort, strength, etca herculean task
  2. (sometimes capital) resembling Hercules in strength, courage, etc
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for herculean

Herculean

adj.

1590s, from Hercules + -an.

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Online Etymology Dictionary, © 2010 Douglas Harper