Definition of enough:

part of speech: adverb

Sufficiently; fully; sometimes it denotes a slight increase or augmentation, as, he is ready enough to oblige; sometimes it expresses indifference or slight, as the music is well enough, that is, not so good as it ought to be; used as an exclamation, to denote fulness or satiety, as, enough.

part of speech: noun

A sufficiency; a quantity which satisfies desire.

part of speech: adjective

That gives content; that satisfies desire; sufficient.