adj. 25B6; adjective FALSE, fake, hollow, artificial, feigned, pretended, put-on; disingenuous, hypocritical, cynical, deceitful, deceptive, duplicitous, double-dealing, two-faced, lying, untruthful, mendacious; informal phoney, pretend, pseud.
INSINCERE
Meaning of INSINCERE in English
Concise Oxford thesaurus English vocabulary. Краткий оксфордский словарь английского языка тезаурус. 2012