Lacking something essential; often construed with in.
Insufficient or inadequate in amount.
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 who is deficient.
Not easy in manner; constrained
I've been uneasy about your friend ever since I met him. Are you sure we can trust him?
Not easy; difficult.
Restless; disturbed by pain, anxiety
Causing discomfort or constraint