Word family noun trust ≠ distrust ≠ mistrust trustee trusteeship trustworthiness adjective trusting trustworthy ≠ untrustworthy trusty distrustful mistrustful verb trust ≠ distrust ≠ mistrust
From Longman Dictionary of Contemporary Englishuntrustworthyun‧trust‧wor‧thy /ʌnˈtrʌstˌwɜːði $ -ˌwɜːr-/ adjective someone who is untrustworthy cannot be trustedExamples from the Corpus
untrustworthy• At best Gordievsky was tolerated by the authorities but still regarded as a traitor and untrustworthy.• It is no good asking for trust if those who make the appeal are behaving in ways that seem so plainly untrustworthy.• Perhaps I was showing too many teeth which could make me appear roguish and untrustworthy.• We tend to think that the Pharisees were unscrupulous, double-dealing, untrustworthy.• As far as John was concerned women were untrustworthy and unpredictable.• What a contrast with the rattled and untrustworthy gamblers at Number 10 and Number 11 Downing Street. 