Lacking something essential; often construed with in.
Insufficient or inadequate in amount.
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 who is deficient.
Painstaking and careful not to miss or omit any detail.
Utter; complete; absolute.
A furrow between two ridges, to drain off the surface water.