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)

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 …

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

Definition of unreliable adjective from the Oxford Advanced Learner's Dictionary. that cannot be trusted or depended on. The trains are notoriously unreliable. He's totally unreliable as a source of …

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

Nov 24, 2025 · Noun [edit] unreliable (plural unreliables) One who or that which cannot be relied upon. quotations

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

UNRELIABLE meaning: 1 : not able to be trusted to do or provide what is needed or promised; 2 : not believable or trustworthy

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.