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Adjective: unreliable  ,ún-ri'lI-u-bul
  1. Not worthy of reliance or trust
    "in the early 1950s computers were large and expensive and unreliable";
    - undependable, flakey [informal], flaky [informal]
  2. Liable to be erroneous or misleading
    "an unreliable generalization";
    - undependable
  3. Dangerously unstable and unpredictable
    "an unreliable trestle";
    - treacherous
  4. Lacking a sense of responsibility

See also: dangerous, erratic, fallible, irresponsible, temperamental, uncertain, unsafe, unsound, untrustworthy, untrusty

Antonym: dependable

Encyclopedia: Unreliable