adequate for the want or need; sufficient for the purpose or to satisfy desire: enough water; noise enough to wake the dead.
an adequate quantity or number; sufficiency.
in a quantity or degree that answers a purpose or satisfies a need or desire; sufficiently.
fully or quite: ready enough.
(used to express impatience or exasperation): Enough! I heard you the first time.

before 900; Middle English enogh, Old English genōh; cognate with German genug, Gothic ganohs, Old Norse nōgr; akin to Old English geneah it suffices, Sanskrit naśati (he) reaches

1. ample. 3. adequately, amply, reasonably.
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World English Dictionary
enough (ɪˈnʌf)
1.  a.  sufficient to answer a need, demand, supposition, or requirement; adequate: enough cake
 b.  (as pronoun): enough is now known
2.  that's enough! that will do: used to put an end to an action, speech, performance, etc
3.  so as to be adequate or sufficient; as much as necessary: you have worked hard enough
4.  (not used with a negative) very or quite; rather: she was pleased enough to see me
5.  (intensifier): oddly enough; surprisingly enough
6.  just adequately; tolerably: he did it well enough
[Old English genōh; related to Old Norse gnōgr, Gothic ganōhs, Old High German ginuog]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

O.E. genog, a common Germanic formation (cf. O.N. gnogr, O.Fris. enoch, Goth. ganohs, Ger. genug), from ge- "with, together" (also a participial, collective, intensive, or perfective prefix) + root -nah, from PIE *nak- "reach, attain" (cf. Skt. asnoti "reaches," Hittite ninikzi "lifts, raises," Lith.
nesti "to bear, carry," L. nancisci "to obtain"). The most prominent among the surviving examples of O.E. ge-, the equivalent of L. com- and Mod.Ger. ge-, from PIE *kom- "beside, near, by, with." Understated sense of have had enough "have had too much" was in O.E. (which relied heavily on double negatives and understatement). Colloquial 'nough said is attested from 1839.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Idioms & Phrases


In addition to the idioms beginning with enough, also see fair enough; had enough; leave well enough alone; not enough room to swing a cat; sure enough; (enough) to wake the dead.

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Example sentences
Remarkably enough, nobody's doing a thing about it.
Despite those imperfections, her performance was good enough to win.
There's simply not enough time.
Worried or not, rich or poor, most people haven't done enough about retirement.
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