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).
Excessively particular, demanding, or fussy about details, especially about tidiness and cleanliness.
Difficult to please; quick to find fault.
Overly concerned about tidiness and cleanliness.