Want of sufficient physical power or strength; as the inability of a man to raise an arm or a leg.

Want of adequate means; as an inability to purchase a farm, or to fit out a ship.

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.

Want of intellectual strength or force; as an inability to comprehend a mathematical demonstration.

Want of knowledge or skill; as an inability to read or write.