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 low condition; weakness; inability.
The act of humbling or abasing oneself.
A state of melancholy or depression; low spirits, the blues.