Insufficient

Part of speech: adjective (a.)

1. Not sufficient; not enough; inadequate to any need, use, or purpose; as, the provisions are insufficient in quantity, and defective in quality. "Insufficient for His praise." Cowper.

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

Synonyms: Inadequate; scanty; incommensurate; unequal; unfit; incompetent; incapable; inefficient.