Meaning & use
untrustworthy
Not deserving belief or confidence; likely to deceive, fail, or behave dishonestly.
See it in a sentence
The witness was considered untrustworthy after investigators found several inconsistencies in her story.
He refused to lend money to his untrustworthy cousin, who never repaid a debt.
A note on using this word
Untrustworthy usually describes character or honesty, while unreliable can simply describe something that fails to perform consistently, such as a machine.
Words with a similar meaning
Choose a synonym to suit the sentence. Meanings can overlap without being identical.
Words with an opposite meaning
trustworthyreliable
Make it your own
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