sinister adjective

Log In sin·​is·​ter | \ ˈsi-nə-stər , archaic sə-ˈni-
Definition of sinister 1: singularly evil or productive of evil 2: accompanied by or leading to disaster 3: presaging ill fortune or trouble 4a: OF, RELATING TO, OR SITUATED TO THE LEFT OR ON THE LEFT SIDE OF SOMETHING especially: being or relating to the side of a heraldic shield at the left of the person bearing it 4b: OF ILL OMEN BY REASON OF BEING ON THE LEFT 5.