Source : WordNet®

ingratiatory
     adj 1: pleasingly persuasive or intended to persuade; "a coaxing
            and obsequious voice"; "her manner is quiet and
            ingratiatory and a little too agreeable" [syn: {coaxing}]
     2: calculated to please or gain favor; "a smooth ingratiating
        manner" [syn: {ingratiating}]