1526, "irreligious, not god-fearing, not in accordance with the laws of God," from un- (1) "not" + pp. of godly (adj.). Cf. M.Du. ongodelijc, Ger. ungöttlich, M.Swed. ogudhlik. Colloquial sense of "outrageous, dreadful" is recorded from 1887.
mod. horrendous; inconceivable. : What do you want at this ungodly hour?
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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