insincere
Word family
Synonym discussion
Sense: adjective/1
All five words describe a gap between what someone shows and what they truly think, but they differ in intensity and context. Disingenuous is the most formal and intellectual — it suggests a calculated, knowing dishonesty, as when a politician pretends not to understand a question. Hypocritical carries moral weight: it means a person claims standards they violate (a nutritionist who eats junk food in private). Two-faced is informal and vivid: it describes someone who says nice things to your face but criticises you behind your back. Fake is casual and broad — it can describe both people and objects (a fake smile, a fake handbag). False overlaps with fake but sounds slightly more formal (false modesty, false hopes). When you simply mean that someone's words or feelings are not genuine and you want a neutral, everyday word, insincere is the safest choice.
Common collocations
Etymology
Formed by adding the Latin negative prefix in- (meaning 'not') to sincere, which comes from Latin sincerus meaning 'clean, pure, sound, untainted'. In ancient Rome, sincerus was used to describe things like unadulterated wine or pure honey; the sense of 'genuine in character' developed later. Insincere entered English in the mid-1500s as the opposite of sincere, carrying the idea of moral impurity or falsehood in words and feelings.