unreliable

Adjective
  1. Liable to be erroneous or misleading (synset 300967779)
    "an undependable generalization"
    similar to: fallible - likely to fail or make errors
    same as: undependable
  2. Not worthy of reliance or trust (synset 300728305)
    "in the early 1950s computers were large and expensive and unreliable"; "an undependable assistant"
    also: untrustworthy, untrusty - not worthy of trust or belief
    similar to:
    same as: undependable
  3. Dangerously unstable and unpredictable (synset 302068530)
    "treacherous winding roads"; "an unreliable trestle"
    similar to: dangerous, unsafe - involving or causing danger or risk; liable to hurt or harm
    same as: treacherous
  4. Lacking a sense of responsibility (synset 302006280)
    similar to: irresponsible - showing lack of care for consequences

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