The quality of being attractive or pleasant to look at; good appearance.
From Old English 'cum' (to come) and '-ly' (forming adjectives), later influenced by Middle English 'comely' (fitting, suitable). The suffix '-ness' was added to create the abstract noun form around the 14th century.
Interestingly, 'comely' originally meant 'fitting' or 'appropriate' before it shifted to mean 'beautiful'—showing how our ancestors valued propriety and decorum so much that suitable behavior and attractive appearance became almost synonymous.
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