lacking sincerity; "a charming but thoroughly insincere woman"; "their praise was extravagant and insincere
The word 'glib' means fluent but insincere.
He made a show of caring and wanting to help, but we knew he was insincere.
sincerely
The opposite could be insincere, or (for enthusiastic) unenthusiastic or unambitious.
lacking sincerity; "a charming but thoroughly insincere woman"; "their praise was extravagant and insincere
It means someone is insincere.
Insincere or ironic, mean
An insincere person should not be trusted
Your countenance belies your insincere request.
An insincere apology is no better than no apology. I noticed that she was insincere when she said the shirt that was too small for me looked good.
The word 'glib' means fluent but insincere.
He made a show of caring and wanting to help, but we knew he was insincere.
yes
No.
The prefix of "sincere" is "sin-." A prefix is a group of letters added at the beginning of a word to change its meaning. In this case, "sin-" comes from the Latin word "sine," meaning "without." In "sincere," the prefix "sin-" combined with "cere" means "without wax," indicating something that is genuine or pure.
Insincere or foolish talk. Origin unknown, first known use 1929. meaningless talk; nonsense.