Not sufficient; not enough; inadequate to any need, use, or purpose; as, the provisions are insufficient in quantity, and defective in quality.

of a quantity not able to fulfill a need or requirement; "insufficient funds"

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

A soldered connection where the conductors have the appearance of being tinned and wetted together without an adequate solder fillet; or there is incomplete coverage of one or more of the metal surfaces being joined.