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Showing results for unreliable. Search instead for ultrareliable.
Synonyms

unreliable

American  
[uhn-ri-lahy-uh-buhl] / ˌʌn rɪˈlaɪ ə bəl /

adjective

  1. not reliable; not to be relied or depended on.

    Synonyms:
    untrustworthy, irresponsible, undependable

unreliable British  
/ ˌʌnrɪˈlaɪəbəl /

adjective

  1. not reliable; untrustworthy

    an unreliable witness

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Other Word Forms

  • unreliability noun
  • unreliableness noun
  • unreliably adverb

Etymology

Origin of unreliable

First recorded in 1830–40; un- 1 + reliable

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Those are even more important because significant under-investment in the electricity and water systems mean they are unreliable and have undermined government pledges to increase domestic production of everything from food to consumer goods.

From BBC

The gadget relies on iridology, a technique by which iris colors and markings are believed to reveal information about a person's health, but which is generally considered scientifically unreliable.

From Barron's

Will it provide a catalyst for the continent to take greater responsibility for its own security in the face of so much instability from what many see as an unreliable ally?

From BBC

“The biggest problem with somebody with Neff’s history is the giant screaming red flag that involves filing a prosecution based on unreliable evidence,” Levitt said.

From Los Angeles Times

With unreliable mobile service, no wi-fi and a deeply superstitious population that does not respect him, Loftis is determined to bring in tourists and secure a better life for his teenage son.

From BBC