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Definition of insufficient:

  1. Not sufficient; not enough; inadequate to any need, use, or purpose; as, the provisions are insufficient in quantity, and defective in quality.
  2. Wanting in strength, power, ability, capacity, or skill; incompetent; incapable; unfit; as, a person insufficient to discharge the duties of an office.

Synonyms:

light, scarce, wanting, too little, big, short, lean, scant, under, deficient, low, shy, excess, inadequate, skimpy, faulty, depleted, substandard, poor.

Usage examples: