It is not an adjective. It is a noun based on the adjective unfit.
yes as unfitness leads to heart attacks
The quality of being inept; unfitness; inaptitude; unsuitableness., Absurdity; nonsense; foolishness.
A disabled person is one with a physical or mental handicap that impedes or impairs his or her daily activities. Legal requirements for disabled status (benefits, parking) vary by location and agency. (see related question)
The person could be depressed.
it causes influenza
pseudohermaphrodite
Nothing causes it it happens on its own
Trait is a characteristic that distinguishes one person from another and that causes a person to behave more or less consistently.
What causes a person to respect another may vary for each person. When a person is kind, honest in their dealings, and respects the beliefs of others, they usually earn the respect of people.
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It causes you to hallucinate.