A person who is deficient.
Insufficient or inadequate in amount.
Lacking something essential; often construed with in.
Of a number n, Having the sum of divisors σ(n)<2n, or, equivalently, the sum of proper divisors (or aliquot sum) s(n).
A failure to fit well; unsuitability, disparity.
She was very unhappy in Iraq and a misfit in the Army.
A badly adjusted person; someone unsuitable or set apart because of their habits, behaviour etc.
To fit badly.