hellaciousPronunciation: /hɛˈleɪʃəs/Definition of hellacious adjective North American informal very great, bad, or overwhelming:there was this hellacious hailstormDerivatives hellaciously adverb Origin: 1930s: from hell + -acious, perhaps suggested by bodacioushellacious in other Oxford dictionaries Definition of hellacious in the US English dictionary
