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Noun: unreliableness  ,ún-ri'lI-u-bul-nus
  1. The trait of not being dependable or reliable
    "His unreliableness made it difficult for his colleagues to trust him with important tasks";
    - undependability, undependableness, unreliability, flakiness [informal]

Type of: irresponsibility, irresponsibleness

Antonym: reliableness