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Resistant to externally applied pressure.
(adjective)
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Marked by or indicating the tone and resiliency of healthy tissue: firm muscles.
(adjective)
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Securely fixed in place: Despite being hit by the car, the post was still firm.
(adjective)
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Indicating or possessed of determination or resolution: a firm voice.
(adjective)
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Constant; steadfast: a firm ally.
(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.