English

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Alternative forms

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Etymology

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Unclear origins; perhaps from hell +‎ -acious

Pronunciation

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Adjective

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hellacious (comparative more hellacious, superlative most hellacious)

  1. horrible, awful, hellish, agonizing
    • 2007, Dan Horgan, Bringing Back Boxing: A Young Journalist's Attempt to Revive the Sweet Science, page 86:
      Because he throws so many hellacious punches, he has the chance of knocking out any fighter on any given night.
  2. nasty, repellent.
  3. (slang) Remarkable, unbelievable, unusual.

Derived terms

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