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 loser; a person who is bound to fail.
A horse that does not run in a race for which it has been entered
A project that has no chance of success