1. (a.) Not enough; inadequate to any need, use, or purpose; as, the provisions are insufficient in quantity\, and defective in quality.

2. (a.) Wanting in strength, power, ability, capacity, or skill; incompetent; incapable; unfit; as, a person insufficient to discharge the duties of an office.

asymmetric base defective deficient disappointing disheartening disparate displeasing disproportionate dissatisfactory failing found wanting half-assed ill-matched ill-sorted imperfect inadequate incommensurate incompetent incomplete inferior irregular lacking little maladroit mean mediocre minus mismatched not comparable not enough not good enough not in it odd out of it out of proportion petty scant scanty scarce shabby short short of shy skew skewed small too little trivial unequal unequal to uneven unfulfilling ungratifying unqualified unreached unsatisfactory unsatisfying unskillful unsufficing wanting