un·​re·​li·​able | \ ˌən-ri-ˈlī-ə-bəl How to pronounce unreliable (audio) \

Definition of unreliable

: not reliable : undependable, untrustworthy an unreliable friend an unreliable source of funding an unreliable car

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Other Words from unreliable

unreliability \ ˌən-​ri-​ˌlī-​ə-​ˈbi-​lə-​tē How to pronounce unreliable (audio) \ noun
the unreliability of the data a person with a reputation for unreliability
unreliably \ ˌən-​ri-​ˈlī-​ə-​blē How to pronounce unreliable (audio) \ adverb
a method that works unreliably

Examples of unreliable in a Sentence

Recent Examples on the Web If the third tally produces yet another number, that is likely to only heighten criticism of a process many election officials have maintained is unreliable and open to error. Andrew Oxford, The Arizona Republic, 14 July 2021 Those networks can be finicky and the Chinese government actively attempts to disrupt them, often causing slow and unreliable connections for everyday tasks such as Google searches. Nathaniel Taplin, WSJ, 6 July 2021 While the Light Rail and several MTA buses list Cherry Hill on their routes, residents say service is both infrequent and unreliable. Isabella Gomes, baltimoresun.com, 18 June 2021 Most of the actual events in Aristotle’s life are hearsay and therefore unreliable. Teddy Mcdarrah, Forbes, 15 June 2021 However, the early gas turbine prototypes did not fulfill their great promise, proving unreliable, thirsty for fuel and incredibly noisy during their trials. Ben Jones, CNN, 8 June 2021 Barty avoided an exit by overcoming an uncharacteristically unreliable serve. Fox News, 2 July 2021 These claims were also deemed unreliable at the time. Natalie Hope Mcdonald, Vulture, 30 June 2021 The applause-o-meter is often an unreliable tool to measure performance, but in this instance, the crowds at Dodger Stadium offer an accurate reading of the situation. Dylan Hernández Columnist, Los Angeles Times, 30 June 2021

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'unreliable.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of unreliable

1810, in the meaning defined above

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Time Traveler for unreliable

Time Traveler

The first known use of unreliable was in 1810

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Last Updated

17 Jul 2021

Cite this Entry

“Unreliable.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/unreliable. Accessed 29 Jul. 2021.

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More Definitions for unreliable



English Language Learners Definition of unreliable

: not able to be trusted to do or provide what is needed or promised
: not believable or trustworthy


un·​re·​li·​able | \ ˌən-ri-ˈlī-ə-bəl \

Kids Definition of unreliable

: not worthy of trust He got rid of his unreliable car.


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