Definition of "Herculean"

Herculean

/hɜːɹˈkjuːliən/

adjective
comparative more Herculean, superlative most Herculean
1. Of extraordinary might, power, size, etc.; suggesting Hercules in size or strength.
  Quotations
  But this is not the best:—look, pr'ythee, Charmian, / How this Herculean Roman does become / The carriage of his chafe.
  c. 1606–1607, William Shakespeare, “The Tragedie of Anthonie and Cleopatra”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, [Act I, scene iii], page 343, column 1
2. Requiring a huge amount of work; of extraordinary difficulty.
  Quotations
  He replied in a dry manner, that I would find it a Herculean task to chastise everybody who should laugh at my expense;
  1748, Tobias George Smollett, The Adventures of Roderick Random
  The guys at Volkswagen have a Herculean task.
  2006, Jeremy Clarkson, Top Gear (TV show), commenting on the Bugatti Veyron automobile
  There are thousands of known isotopes, and to have a functional and easily maintainable exhibit for all of these would require a Herculean effort.
  2012, John Nonte, Supercollider 4