The meaning of UNRELIABLE is not reliable : undependable, untrustworthy. How to use unreliable in a sentence.

(Definition of unreliable from the Cambridge Academic Content Dictionary © Cambridge University Press)

1. inaccurate, unconvincing, implausible, mistaken, false, uncertain, fake, deceptive, erroneous, unsound, fallible, specious, delusive The figures were unreliable because the sample sizes were too …

If you describe a person, machine, or method as unreliable, you mean that you cannot trust them. Diplomats can be a notoriously unreliable and misleading source of information. His judgement was …

Definition of unreliable adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

Jan 14, 2026 · Noun unreliable (plural unreliables) One who or that which cannot be relied upon.

unreliable, adj. meanings, etymology, pronunciation and more in the Oxford English Dictionary

Unreliable means not able to be trusted or depended on. It describes someone or something that is inconsistent, unpredictable, or likely to fail in performance or accuracy.

UNRELIABLE definition: not reliable; not to be relied or depended on. See examples of unreliable used in a sentence.

Unreliable definition: Marked by or exhibiting a lack of reliability.