adjective
doubtful or suspicious of someone or something
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The new employee was mistrustful of her colleagues until she got to know them better.
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She's always been a bit mistrustful of strangers, but she warms up quickly once she gets to know them.
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I don't blame you for being mistrustful of that guy, he gives off a weird vibe.
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Her heart had been broken so many times that she had become mistrustful of love itself.