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 in poor health or sickly, especially one who is constantly obsessed with their state of health
Sickly, infirm, of ailing health
Being overly worried about one's health.