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Habitually abstemious in the use of alcoholic liquors or drugs; temperate.
(adjective)
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Not intoxicated or affected by the use of drugs.
(adjective)
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Plain or subdued: sober attire.
(adjective)
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Devoid of frivolity, excess, exaggeration, or speculative imagination; straightforward: gave a sober assessment of the situation.
(adjective)
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Marked by seriousness, gravity, or solemnity of conduct or character. See Synonyms at serious.
(adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.