Completely clean and perfect without any marks, stains, damage, or flaws on the surface or in reputation.
From 'un-' (not) + 'blemish' (from Old French 'blesmir' meaning to turn pale or discolor), dating to the 1600s; the 'un-' prefix created the opposite meaning of marked or damaged.
Calling someone's record 'unblemished' originally meant their skin was pale and colorless—same root as 'blemish'—showing how beauty standards and reputation got weirdly tangled together in old English.
Complete word intelligence in one call. Free tier — 50 lookups/day.