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Definitions

untrustworthy

ADJECTIVE
not dependable, unfaithful
Synonyms
STRONGEST
deceitful dishonest disloyal false irresponsible treacherous unreliable unsafe
STRONG
untrusty
WEAK
capricious conniving crooked devious dubious fair-weather faithless fickle fink fly-by-night guileful questionable shady sharp shifty slippery sneaky tricky trustless two-faced two-timing unassured undependable unsure untrue
Antonyms
STRONGEST
faithful frank harmless honest loyal open reliable responsible true trustworthy truthful
WEAK
dependable

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

This flies in the face of all we know about its inner workings: AI can’t think, doesn’t have a mind and, in fact, is inherently untrustworthy.

From The Wall Street Journal • Mar. 20, 2026

The Nursing Home Abuse & Neglect Law Firm in Omaha, Neb., gives the following scenario: “An untrustworthy agent might put someone in a nursing home for their own benefit or convenience instead of actual need.”

From MarketWatch • Feb. 24, 2026

Americans also think A.I. is untrustworthy as a tool.

From Slate • Dec. 26, 2025

According to analysts, risks to stablecoins include an issuer deemed untrustworthy or the threat of hacking.

From Barron's • Nov. 10, 2025

“Were you doing anything untrustworthy at the time?” said Hermione shrewdly.

From "Harry Potter And The Prisoner Of Azkaban" by J.K. Rowling