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).
The act of depriving someone of such basic necessities; deprivation.
The state of being deprived of or lacking an attribute formerly or properly possessed; the loss or absence of such an attribute.
The state of being very poor, and lacking the basic necessities of life.