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Adjective: undependable  ,ún-di'pen-du-bul
  1. Liable to be erroneous or misleading
    "an undependable generalization";
    - unreliable
     
  2. Not worthy of reliance or trust
    "an undependable assistant";
    - unreliable, flakey [informal], flaky [informal]

See also: erratic, fallible, temperamental, uncertain, unsound, untrustworthy, untrusty

Antonym: reliable

Nearest

undelete
undelineated
undemanding
undemocratic
undemocratically
undemonstrative
undeniable
undeniably
undenominational
undependability
undependable
undependableness
undependably
undepicted
under
under-
under a cloud
under arms
under attack
under fire
under the circumstances