Noah Webster
Inability
INABIL'ITY, noun [Latin inhabilis; in and habilis.]
1. Want of sufficient physical power or strength; as the inability of a man to raise an arm or a leg.
2. Want of adequate means; as an inability to purchase a farm, or to fit out a ship.
3. Want of moral power. Moral inability is considered to be want of inclination, disposition or will, or a deep-rooted aversion to act, and therefore improperly so called.
Moral inability aggravates our guilt.
4. Want of intellectual strength or force; as an inability to comprehend a mathematical demonstration.
5. Want of knowledge or skill; as an inability to read or write.