c. 1400, "not in agreement, unamiable," from Old French desagreable (13c.), from des- "not, opposite of" (see dis-) + agreable "pleasing; in agreement; consenting" (see agreeable). Meaning "not in accord with one's taste, offensive to the mind or senses" is from 1690s. Related: Disagreeably; disagreeableness. Slightly earlier in same sense was unagreeable (late 14c.). Related: Disagreeability.