hellacious

/hɛˈleɪʃəs/
adjective
  1. Extremely difficult, unpleasant, or intense.
    • The hike up the mountain was hellacious, but the view was worth it.
    • She had a hellacious headache after staring at the computer screen all day.
    • We had a hellacious storm last night that knocked out the power.
  2. Remarkable or impressive in a surprising way; very large or extreme.
    • He hit a hellacious home run that cleared the stadium wall.
    • The company made a hellacious profit this quarter.
    • That was a hellacious party — I've never seen so many people.
Antonyms
What does "hellacious" mean? | whatsthatwordmean | whatsthatwordmean