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Noun: inability  ,i-nu'bi-li-tee
  1. Lack of ability (especially mental ability) to do something
    "His inability to concentrate hindered his studies"
     
  2. Lacking the power to perform
    "His inability to swim made him hesitant to join the beach party";
    - unfitness

Derived forms: inabilities

Type of: cognition, noesis [technical], quality

Antonym: ability

Encyclopedia: Inability