disapproval If you say that someone is insincere, you are being critical of them because they say things they do not really mean, usually pleasant, admiring, or encouraging things. Some people are so terribly insincere you can never tell if they are telling the truth sincere + insincerity in·sin·cer·ity Too many superlatives lend a note of insincerity. sincerity. pretending to be pleased, sympathetic etc, especially by saying nice things, but not really meaning what you say
Not being in truth what one appears to be; not sincere; dissembling; hypocritical; disingenuous; deceitful; false; said of persons; also of speech, thought; etc