Etymology
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hellish (adj.)

1520s, from hell + -ish. Related: Hellishly; hellishness. Earlier in same sense were helli "helly" (late 12c.); hellen "hellish, infernal" (c. 1200), with -en (2); and Old English hellic and hellcund.

updated on June 14, 2015

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Definitions of hellish from WordNet

hellish (adj.)
(informal) very unpleasant;
hellish weather
Synonyms: beastly / god-awful
hellish (adj.)
extremely evil or cruel; expressive of cruelty or befitting hell;
hellish torture
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.