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Adjective: malfunctioning  ,mal'fúngk-shu-ning
  1. Not performing or able to perform its regular function
    "a malfunctioning valve";
    - nonfunctional
Verb: malfunction  ,mal'fúngk-shun
  1. Fail to function or function improperly
    "the coffee maker malfunctioned";
    - misfunction

See also: amiss, awry, bad, defective, haywire, out of whack, run-down, wrong

Type of: break, break down, conk out [informal], die, fail, give out, give way, go, go bad, pack up [Brit, informal]

Antonym: go

Encyclopedia: Malfunctioning