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).
detriment; misfortune.
physical injury; hurt; damage
That which causes injury, damage, or loss.
emotional or figurative hurt
To cause injury to another; to hurt; to cause damage to something.