(+ from) to deter or discourage (somebody) from a course of action by persuasion
dissuasion /-ʹswayzh(ə)n/ noun
dissuasive /-siv, -ziv/ adj
dissuasively /-sivli, -zivli/ adv
dissuasiveness /-sivnəs, -zivnəs/ noun
[French dissuader from Latin dissuadēre to advise against, from dis- + suadēre to urge]