unreliable

adjective

un·​re·​li·​able ˌən-ri-ˈlī-ə-bəl How to pronounce unreliable (audio)
Synonyms of unreliablenext
: not reliable : undependable, untrustworthy
an unreliable friend
an unreliable source of funding
an unreliable car
unreliability noun
the unreliability of the data
a person with a reputation for unreliability
unreliably adverb
a method that works unreliably

Examples of unreliable in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
For various unfair and unfounded reasons, many scholars have characterized Bianchi as an always unreliable source. Via Chronicle Books, Literary Hub, 11 Dec. 2025 The more eerie, unhinged and unreliable the narrator, the better. Bryan West, USA Today, 11 Dec. 2025 Trump’s tariff war, for example, has accelerated de-dollarization by making the United States an unreliable arbiter of the global economy. Elizabeth Economy, Foreign Affairs, 9 Dec. 2025 But even if the victories come, unreliable blocking will chip away at any quarterback’s game. Tom Krasovic, San Diego Union-Tribune, 7 Dec. 2025 See All Example Sentences for unreliable

Word History

First Known Use

1810, in the meaning defined above

Time Traveler
The first known use of unreliable was in 1810

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Cite this Entry

“Unreliable.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/unreliable. Accessed 13 Dec. 2025.

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