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 person or thing that is helpless, inefficient, or disabled.
An elected official who has lost the recent election or is not eligible for reelection and is marking time until leaving office.