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

plural of enough

A sufficient or adequate number, amount, etc.

Stop! Don't do that any more!

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

Sufficient; all that is required, needed, or appropriate.

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

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

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

Synonym of good enough: acceptable, imperfect but adequate for the purpose.