1. Want of ability.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• inablilty,
• inhability,
• inabiltity,
• inabilty,
• aability,
• iability,
• inablitlity,
• irrability,
• inabbility,
• eability,
• inaplity,
• avability,
• inabiity,
• inabilit,
• inabililty,
• unability,
• inabuility,
• inabillity,
• unablity,
• inabliity

• invalidism,
• infiltrator,
• infallible,
• invalid,
• nobility,
• infiltrate,
• ability,
• infelicity,
• invalidity,
• inbuilt.

The adjective form of "inability" is "unable".

The plural of the "inability" can be the "inabilities".

The singular of the "inability" can be the "inability".