From in- (“negative”) +‎ capacity.

• IPA^(key): /ˌɪnkəˈpæsɪti/

• Audio (US):

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incapacity (countable and uncountable, plural incapacities)

1. The lack of a capacity; an inability.
   • 1605, Francis Bacon, “(please specify |book=1 or 2)”, in The Twoo Bookes of Francis Bacon. Of the Proficience and Aduancement of Learning, Diuine and Humane, London: […] [Thomas Purfoot and Thomas Creede] for Henrie Tomes, […], →OCLC:

     So that it is not the insufficiency or incapacity of man's mind, but it is the remote standing or placing thereof that breedeth these mazes and incomprehensions;

2. Legal disqualification.

• inoperancy
• incapacitation