If you describe someone as conniving, you mean you dislike them because they make secret plans in order to get things for themselves or harm other people.
[disapproval]
Edith was seen as a conniving, greedy woman.
Synonyms: scheming, designing, plotting, calculating More Synonyms of conniving
conniving in British English
(kəˈnaɪvɪŋ)
adjective
plotting secretly; conspiring
Examples of 'conniving' in a sentence
conniving
You've been conniving with Susan; you knew all about it; she took her lead from you; she's told me about you and l, ambert.
Weldon, Fay SPLITTING (2002)
I don't think I've ever encountered a more backbiting, conniving noble.
Robin Hobb THE GOLDEN FOOL: BOOK TWO OF THE TAWNY MAN (2002)