adjective, soberer, soberest.
not intoxicated or drunk.
habitually temperate, especially in the use of liquor.
quiet or sedate in demeanor, as persons.
marked by seriousness, gravity, solemnity, etc., as of demeanor, speech, etc.: a sober occasion.
subdued in tone, as color; not gay or showy, as clothes.
free from excess, extravagance, or exaggeration: sober facts.
showing self-control: sober restraint.
sane or rational: a sober solution to the problem.
verb (used with object), verb (used without object)
to make or become sober: (often followed by up ).

1300–50; Middle English sobre < Old French < Latin sōbrius

soberingly, adverb
soberly, adverb
soberness, noun
nonsober, adjective
nonsoberly, adverb
nonsoberness, noun
nonsobering, adjective
quasi-sober, adjective
quasi-soberly, adverb
unsober, adjective
unsoberly, adverb
unsoberness, noun
unsobered, adjective
unsobering, adjective

2. abstinent, abstemious. 4. serious, quiet, sedate, subdued, staid. See grave2. 5. somber, dull. 7. composed, collected. 8. reasonable, sound.

4. gay. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sober (ˈsəʊbə)
1.  not drunk
2.  not given to excessive indulgence in drink or any other activity
3.  sedate and rational: a sober attitude to a problem
4.  (of colours) plain and dull or subdued
5.  free from exaggeration or speculation: he told us the sober truth
6.  (usually foll by up) to make or become less intoxicated, reckless, etc
[C14 sobre, from Old French, from Latin sōbrius]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

c.1300, "grave, serious, solemn," from O.Fr. sobre, from L. sobrius "not drunk, temperate," from se- "without" + ebrius "drunk," of unknown origin. Sense of "moderate, temperate," especially "abstaining from strong drink" is first attested mid-14c.; meaning "not drunk at the moment" is from late 14c.
The verb meaning "to become sober" is attested from 1820 (usually with up). Sobersides "sedate, serious-minded person" is recorded from 1705.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
In short, coffee-houses were calm, sober and well-ordered establishments that
  promoted polite conversation and discussion.
AA is also suspicious, as many regular members do not stay sober, many drop out
  and many die.
Am generally quite sober, but will be sure to watch myself if drinking.
More sober minds suggested the box was a clock or a navigational device, but
  even those interpretations rested on skimpy evidence.
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