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Uncapable (adjective)
Not capable; incapable.
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Incapable (adjective)
Not capable (of doing something); unable.
“A pint glass is incapable of holding more than a pint of liquid.”
“I consider him incapable of dishonesty.”
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Incapable (adjective)
Not in a state to receive; not receptive; not susceptible; not able to admit.
“incapable of pain, or pleasure; incapable of stain or injury”
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Incapable (noun)
One who is morally or mentally weak or inefficient; an imbecile; a simpleton.
Wiktionary