'even-bearded' originates from Modern English as a compound of 'even' and 'bearded', where 'even' originally (from Old English 'efen') meant 'level, equal' and 'beard' (from Old English 'beard') meant 'facial hair'.

'even' came from Old English 'efen' -> Middle English 'even', and 'beard' from Old English 'beard' -> Middle English 'berd'; the compound form 'even-bearded' is a transparent Modern English formation combining the two words to describe beard appearance.

Initially the elements meant 'level/equal' and 'facial hair'; combined in Modern English they have retained the literal sense of 'having a beard of even appearance', with limited figurative extension.