Hellacious adjective informal slang
Terrible or awful
The weather was hellacious, so we had to cancel our picnic.
Traffic was held up by a hellacious accident.
Excellent or impressive
His collection of paintings is hellacious.
Her first performance was so hellacious that almost audiences were raving about it.
Strong body, mind or will
The top quality
1. Good or fantastic
2. (of a person) Attractive, or sexy
3. A sexually attractive person
Someone or something is so good or successful that it's impossible for anyone or anything who comes after them to follow.
In flawless condition