Definition of incapable
1 : lacking capacity, ability, or qualification for the purpose or end in view: such as
a : not able or fit for the doing or performance : incompetent
b : not being in a state or of a kind to admit : insusceptible
c archaic : not able to take in, hold, or keep
d archaic : not receptive
2 : lacking legal qualification or power (as by reason of mental incompetence) : disqualified
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Time Traveler for incapable
The first known use of incapable was in 1594
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