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Having lost freshness, effervescence, or palatability: stale bread; stale air.
(adjective)
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Lacking originality or spontaneity: a stale joke.
(adjective)
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Impaired in efficacy, vigor, or spirit, as from inactivity or boredom.
(adjective)
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Law Having lost effectiveness or force through lack of exercise or action.
(adjective)
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To make or become stale.
(verb-transitive)
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.