Etymology
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god-awful (adj.)

also godawful, according to OED from 1878 as "impressive," 1897 as "impressively terrible," but it seems not to have been much in print before c. 1924, from God + awful. The God might be an intensifier or the whole might be from the frequent God's awful (vengeance, judgment, etc.), a common phrase in religious literature.

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Definitions of god-awful

god-awful (adj.)
(informal) very unpleasant;
stop that god-awful racket
Synonyms: beastly / hellish
From wordnet.princeton.edu