Insincere describes words, actions, or expressions that are not genuine, honest, or truthful. It implies a lack of sincerity, often involving pretense, deceit, or a deliberate attempt to mislead or feign a feeling or belief.
An Insincere person often says things they don't mean, or does things for ulterior motives rather than genuine care.
The underlying intent is frequently to gain some advantage or to avoid causing offense, rather than expressing heartfelt emotions or beliefs.
It suggests a superficiality that lacks depth or authentic feeling. .
SHAM
PHONY FALSE
PHONEY UNFELT HOLLOW SMARMY
UNMEANT
TWOFACED
DECEITFUL DISHONEST
MERETRICIOUS DISINGENUOUS MEALYMOUTHED HYPOCRITICAL