Any mark of deformity or injury, whether physical or moral; anything; that diminishes beauty, or renders imperfect that which is otherwise well formed; that which impairs reputation. He shall take two he lambs without blemish, and one ewe lamb of the first year without blemish. (Lev. Xiv. 10) The reliefs of an envious man are those little blemishes and imperfections that discover themselves in an illustrious character. (Spectator)
Synonym: spot, speck, flaw, deformity, stain, defect, fault, taint, reproach, dishonor, imputation, disgrace.