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.
ineffectual; useless; fruitless.
To cause stress or annoyance.
To disappoint or defeat; to vex by depriving of something expected or desired.
To hinder or thwart.