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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, excess, substandard, low, scant, depleted, under, lean, big, shy, too little, wanting

minimal, little, minimum, negligible, spotty, few

imperfect, faulty, inadequate

incomplete, undone, discontinuous, partial, missing, unachieved, immature, embryonic, unaccomplished, curtailed, segmental, patchy, sectional, deficient, unsatisfactory, unfinished, short, unfulfilled, scanty, fragmentary, fractional, unattained, lacking

niggardly, flyspeck, skimpy, poor, scarce, sparse, meager, miserly, stingy

inferior, intolerable, inappropriate, inadmissible, unacceptable, untenable, unsuitable

Usage examples:

• I had only ten or twelve guineas left, and this sum was insufficient. - "The Memoires of Casanova, Complete The Rare Unabridged London Edition Of 1894, plus An Unpublished Chapter of History, By Arthur Symons", Jacques Casanova de Seingalt.
• It may be insufficient. - "The Club of Queer Trades", G. K. Chesterton.
• The light was insufficient to show the expression upon the speaker's face, but his voice told of a great wonder. - "The Quest of the Sacred Slipper", Sax Rohmer.