Not sufficient; of a type or kind that does not suffice, that does not satisfy requirements or needs.
Not sufficient; lacking competent power or ability; unqualified, unequal, unfit.
An inadequate quantity of; not enough.
A quantity (of something) that is less than is needed.
Trivial, or of little importance.
Of suspicious character, typically secretive or deceitful; shady.
Idle or frivolous.
The act of one who trifles; frivolous behaviour.