unreliable
[adjective]
Synonyms:
- undependable, irresponsible, treacherous, untrustworthy
- uncertain, deceptive, fallible, false, implausible, inaccurate, unsound

---

Antonyms: reliable
Contrasted words: dependable, trustworthy, trusty, constant, faithful, true
Related Idioms: not to be depended (or relied) on
Related Words: fickle, inconstant, unstable, vacillating, faithless, false, untrue, falsehearted, perfidious, shifty, slick, slippery, tricky, inaccurate, inexact, unfaithful

[TahlilGaran] English Synonym Dictionary ▲

un‧re‧li‧a‧ble AC /ˌʌnrɪˈlaɪəbəl◂/ adjective
[Word Family: noun: reliability, reliance; adjective: reliable ≠ unreliable, reliant; verb: rely; adverb: reliably]
unable to be trusted or depended on:
The car’s becoming very unreliable.
an unreliable witness

[TahlilGaran] Dictionary of Contemporary English ▲