Definitions for "Insincere"
Not being in truth what one appears to be; not sincere; dissembling; hypocritical; disingenuous; deceitful; false; -- said of persons; also of speech, thought; etc.; as, insincere declarations.
lacking sincerity; "a charming but thoroughly insincere woman"; "their praise was extravagant and insincere"
Disappointing; imperfect; unsound.