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.

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Definitions of hellish

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
From wordnet.princeton.edu