The quality, state, or degree of being beautiful; the possession of aesthetic appeal, grace, or attractiveness.
From 'beautiful' plus '-ness' (abstract noun suffix creating quality nouns), following the pattern seen in 'happiness' or 'brightness.' Emphasizes the intrinsic quality of beauty.
While 'beauty' and 'beautifulness' mean almost the same thing, 'beautifulness' sounds more formal and emphasizes how much of that beautiful quality something has—it's about degree and intensity!
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