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).
Crowded with many people.
Coming from or produced by a large number of beings or objects.
Existing in great numbers; innumerable.
Comprising a large number of parts.