Mistrustful
/mɪˈstrʌstfəl/
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Definition
(adj) Having mistrust, lacking trust (in someone or something).
Sentence Examples
I'm not mistrustful; I'm simply cautious.
Tom is becoming more mistrustful.
CEFR Practice Quiz
After being lied to several times by his colleagues, Mark became very ____ of any new information he received in the office.