untrustworthy

adjective

un·​trust·​wor·​thy ˌən-ˈtrəst-ˌwər-t͟hē 

: not dependable or worthy of confidence : not trustworthy

an untrustworthy person

an untrustworthy source

Examples of untrustworthy in a Sentence

Recent Examples on the Web

Personal Recommendations from your Local Lit Hub Editors The weather has become untrustworthy, for determining the seasons and otherwise. — Emily Temple, Literary Hub, 8 Sep. 2026

The advanced flow is intentionally more difficult to use on the first try and is designed to discourage users from downloading apps from untrustworthy sources. — James Peckham, PC Magazine, 19 Aug. 2026

Lawyers representing Elon Musk, who sued OpenAI, Altman and Brockman in 2024 over a dispute about the company's corporate structure, used Altman's firing as a way to cast doubt on his character, accusing him of being untrustworthy. — Ashley Capoot,kate Rooney, CNBC, 14 Aug. 2026

Indeed, El Niño’s complexity limited the researchers’ simulations to two years; beyond that, the model becomes untrustworthy. — Cody Cottier, Scientific American, 8 July 2026

Word History

First Known Use

circa 1846, in the meaning defined above

Rhymes for untrustworthy

• creditworthy
• blameworthy
• newsworthy
• noteworthy
• praiseworthy
• trustworthy
• unworthy
• worthy