The quality or condition of being without a beard; youth or immaturity (archaic usage), or simply the state of having a smooth face.
From Middle English 'berd' (beard) with suffixes '-less' (without) and '-ness' (state of being), creating a double-suffixed noun.
Medieval writers who invented 'beardlessness' needed a fancy noun for 'lack of beard' because beards were such an important identity marker—now it's a word almost nobody uses!
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