Lack of the ability to do something; incapability.
[…] tho' theſe ſeem'd to be very unfit Inſtruments for compaſſing of that great Deſign for which they were then employ'd, becauſe of their Inability and Uncapacity in performing the Work ſo very great and important; […]
Lack of the option to do something; powerlessness.
From earlier inhability (“disqualification for office”), equivalent to in- + ability. Compare Middle French inhabilité, Medieval Latin inhabilitās.
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