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Adjective: hellacious  he'ley-shus
Usage: N. Amer
  1. Very unpleasant
    - beastly, hellish, god-awful, horrible

See also: unpleasant

Nearest

Helix aspersa
Helix hortensis
Helix pomatia
hell
Hell
he'll
hell dust
hell on earth
hell raising
hell to pay
hellacious
Helladic
Helladic civilisation
Helladic civilization
Helladic culture
hellbender
hell-bent
hellbound
hellcat
hellebore
helleborine