Adequate for the purpose.
Resistant to deformation or flow.
Having sufficient skill, knowledge, ability, or qualifications.
Having jurisdiction or authority over a particular issue or question.
Permeable to foreign DNA.
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.