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 patient who does not respond to medical treatment.
An opponent in combat or in training.
An undesirable hospital patient, or a patient who does not need medical care.
A stupid, awkward, or oafish person.
An inept trainee or serviceperson.
A conical chamber at the breech of the bore in heavy ordnance, especially in mortars.
A dirty, senile, or otherwise unpleasant patient.