hellacious
horrible, awful, hellish, agonizing, difficult.
Adjective
- 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. - 2007, Dan Horgan, Bringing Back Boxing: A Young Journalist's Attempt to Revive the Sweet Science, page 86:
- nasty, repellent.
- Remarkable, unbelievable, unusual.
Origin
Unclear origins; perhaps from hell + -acious