English to English

adjective (a)

• of a quantity not able to fulfill a need or requirement(adj.all)

  Example:
  Insufficient funds.
  

  Synonym:
  deficient
  Antonym:
  sufficient
  

  source: wordnet30
• Not sufficient; not enough; inadequate to any need, use, or purpose; as, the provisions are insufficient in quantity, and defective in quality.(adjective)

  source: webster1913