From Middle English ugly, uggely, uglike, borrowed from Old Norse uggligr, from uggr (possibly related to agg), equivalent to ug + -ly. Cognate with Scots ugly, uglie, Icelandic ugglegur. Meaning softened to "very unpleasant to look at" around the late 14th century, and sense of "morally offensive" attested from around 1300.
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