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).
A person who is deficient.
Of an amount or number: very small.
So appalling or sad that one feels or should feel sorry for it; eliciting pity.
In a pitiful manner; pitifully; piteously; pathetically.