un·clean·ly I. \-enlē, -li\adjective Etymology: Middle English unclenly, from Old English unclǣnlic, from un- (I) + clǣnlic pure — more at cleanly 1.: morally unclean : impure < uncleanly thoughts > 2.: physically unclean : filthy < his uncleanly habits of spitting — Hamlin Garland > II. \|ən|klēnlē\adverb Etymology:unclean + -ly : in an unclean manner