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.
Directly to the point; plain
Using plain direct language; accustomed to express opinions directly and bluntly; blunt.
Complete; absolute
Really; actually; quite