If you have a sufficient amount of something, it's enough — not too much, not too little, just right. Goldilocks would be pleased.

Sufficient comes from a Latin verb meaning "to meet the need." If something is sufficient it has met, or satisfied, a need. Enough is often used as a synonym for sufficient, and when something is not sufficient, it is too little to take care of what's needed. Sufficient can, however, also suggest just enough and not an abundance, as in "the money was sufficient for groceries, but we needed more to fill the gas tank."

Definitions of sufficient
  1. adjective
    of a quantity that can fulfill a need or requirement but without being abundant
    sufficient food”
    more than enough in size or scope or capacity
    adequate, decent, enough
    sufficient for the purpose
    sufficient to provide comfort
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    deficient, insufficient
    of a quantity not able to fulfill a need or requirement
    meager, meagerly, meagre, scrimpy, stingy
    deficient in amount or quality or extent
    depleted, low
    no longer sufficient
    inadequate, poor, short
    not sufficient to meet a need
    lean, skimpy
    containing little excess
    light, scant, short
    less than the correct or legal or full amount often deliberately so
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