Simple Definition of hellacious
: very difficult, large, or powerful
Full Definition of hellacious
1 : exceptionally powerful or violent
2 : remarkably good
3 : extremely difficult
4 : extraordinarily large
Examples of hellacious
Traffic is hellacious this time of day.
<the hellacious heat was more than we could bear>
Origin of hellacious
hell + -acious (as in audacious)
First Known Use: 1929
Rhymes with hellacious
audacious, bodacious, capacious, cetaceous, crustaceous, curvaceous, drupaceous, edacious, fallacious, flirtatious, fugacious, herbaceous, loquacious, mendacious, micaceous, pomaceous, predaceous, pugnacious, rapacious, rosaceous, sagacious, salacious, sebaceous, sequacious, setaceous, tenacious, testaceous, tufaceous, ungracious, veracious, vinaceous, voracious
Learn More about hellacious
Thesaurus: All synonyms and antonyms for "hellacious"
Seen and Heard
What made you want to look up hellacious? Please tell us where you read or heard it (including the quote, if possible).