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).
An incompetent, indolent, or clumsy person.
Any of various nymphalid butterflies of the genus Discophora.
A player having little skill, especially a golfer who duffs.
A racing pigeon that does not perform well.
A cow that does not produce milk.