Synonyms of 'conniving'
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If you describe someone as calculating, you disapprove of the fact that they deliberately plan to get what they want, often by hurting or harming other people.
He is a cool, calculating and clever criminal.
artful and scheming; conniving; crafty
the wily cunning of a designing hypocrite
Thesaurus for conniving from the Collins English Thesaurus
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.