Pronunciation: (in-kā'pu-bul), [key]
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.
4. incapable of,
a. not having the ability, qualification, or strength for (a specified act or function).
b. not open to; not susceptible to or admitting: These materials are incapable of exact measurement.
c. legally unqualified for.
a thoroughly incompetent person, esp. one of defective mentality.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.