An incompetent person, a blockhead; a loser.
The thick end, especially of a piece of wood or of a joint of meat.
A gullible person; a sucker; someone easily taken advantage of; someone lacking common sense.
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).