A person who is deficient.
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 lacking a sense of direction in life; an underachiever.
A user of the Slackware Linux distribution.
A member of a certain 1990s subculture associated with Generation X.
One who procrastinates or is lazy.