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enough

adjective

adequate for the want or need; sufficient for the purpose or to satisfy desire: enough water; noise enough to wake the dead.

pronoun

an adequate quantity or number; sufficiency.

adverb

in a quantity or degree that answers a purpose or satisfies a need or desire; sufficiently.
fully or quite: ready enough.

interjection

(used to express impatience or exasperation): Enough! I heard you the first time.

determiner

1. sufficient to answer a need, demand, supposition, or requirement; adequateenough cake
2. (as pronoun)enough is now known
that’s enough! that will do: used to put an end to an action, speech, performance, etc

adverb

so as to be adequate or sufficient; as much as necessaryyou have worked hard enough
(not used with a negative) very or quite; rathershe was pleased enough to see me
(intensifier)oddly enough; surprisingly enough
just adequately; tolerablyhe did it well enough

adj.

c.1300, from Old English genog, a common Germanic formation (cf. Old Saxon ginog, Old Frisian enoch, Dutch genoeg, Old High German ginuog, German genug, Old Norse gnogr, Gothic ganohs).

This is a compound of ge- “with, together” (also a participial, collective, intensive, or perfective prefix) + root -nah, from PIE *nek- “reach, attain” (cf. Sanskrit asnoti “reaches,” Hittite ninikzi “lifts, raises,” Lithuanian nešti “to bear, carry,” Latin nancisci “to obtain”).

It is the most prominent among the surviving examples of Old English ge-, the equivalent of Latin com- and Modern German ge-, from PIE *kom- “beside, near, by, with” (see com-).

Meaning “moderately, fairly, tolerably” (good enough) was in Middle English. Understated sense of have had enough “have had too much” was in Old English (which relied heavily on double negatives and understatement). Colloquial ‘nough said is attested from 1839.

In addition to the idioms beginning with enough

enough is enough
enough rope, give someone
enough said
enough to sink a ship

also see:

fair enough
had enough
leave well enough alone
not enough room to swing a cat
sure enough
(enough) to wake the dead