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.
Oh, dude, the prefix of sincere is "in-"! Like, you know when you add "in-" to "sincere," you get "insincere," which is like the total opposite of being genuine and honest. So, yeah, it's just a little letter combo that changes the whole vibe of the word.
Insincere or foolish talk. Origin unknown, first known use 1929. meaningless talk; nonsense.