Hellacious

//hɛˈleɪʃəs// adj, slang

adj, slang ·Moderate ·College level

Definitions

Adjective
  1. 1
    horrible, awful, hellish, agonizing, difficult.

    "Because he throws so many hellacious punches, he has the chance of knocking out any fighter on any given night."

  2. 2
    nasty, repellent.
  3. 3
    Remarkable, unbelievable, unusual. slang

Example

More examples

"Because he throws so many hellacious punches, he has the chance of knocking out any fighter on any given night."

Etymology

Unclear origins; perhaps from hell + -acious

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.