1. not capable.
  2. not having the necessary ability, qualification, or strength to perform some specified act or function: As an administrator, he is simply incapable.
  3. without ordinary capability; incompetent.


  1. a thoroughly incompetent person, especially one of defective mentality.
  1. incapable of,
    1. not having the ability, qualification, or strength for (a specified act or function).
    2. not open to; not susceptible to or admitting: These materials are incapable of exact measurement.
    3. legally unqualified for.


  1. (when postpositive, often foll by of) not capable (of); lacking the ability (to)
  2. powerless or helpless, as through injury or intoxication
  3. (postpositive foll by of) not susceptible (to); not admitting (of)a problem incapable of solution

1590s, from Middle French incapable and directly from Medieval Latin incapabilis, from in- “not” (see in- (1)) + capabilis (see capable). Related: Incapably; incapability.

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