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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.

As for working out one's geographic position, though, Chris Shaw, co-founder and chief executive of Advanced Navigation, says his firm's tech can use alternatives when GPS proves unavailable or unreliable.

From BBC

When she recognizes a village, “where my father lost our red Shorthorn in a game of forty-five,” we suspect that money is short and her father unreliable.

From The Wall Street Journal

Persian sources are thin and probably unreliable about his war service, including whether he actually saw combat in the Islamic Revolutionary Guard Corps.

From The Wall Street Journal

The challenge, as explained to Northwestern Now by the center’s founder and professor Erik Nisbet, is that standard measures of democratic commitment are unreliable.

From Salon

Leah’s book, The Missing Link in Modern Spiritualism, is thorough, yet often unreliable, and obviously one-sided in support of the spirits.

From Literature