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Noun: undependability  ,ún-di,pen-du'bi-lu-tee
  1. The trait of not being dependable or reliable
    "His undependability made it difficult for his colleagues to trust him with important tasks";
    - undependableness, unreliability, unreliableness, flakiness [informal]

Type of: irresponsibility, irresponsibleness

Antonym: dependability