One should be satisfied; nothing additional is required. / (especially as an expression of exasperation) The limit of patience or tolerance has been reached.

The state or condition of being enough; sufficiency; adequacy.

plural of enough

Sufficiently. / Fully; quite; used after adjectives to express slight augmentation of the positive degree, and sometimes equivalent to very.

A sufficient or adequate number, amount, etc.

Stop! Don't do that any more!

(rare, chiefly in the plural) An instance of being sufficient, or of doing something sufficiently.

equal to what is needed; as much as required

(informal) Mature, grown-up, old enough (with the implication that one can look after oneself and make one's own decisions).

(idiomatic, evaluative) Just as one would expect.