Synonyms|576Antonyms|83|Broader|17Narrower|5Related|326
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slack off(expression, tighten)
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slacken
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slowed down
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slowing down
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softened
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softens
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straighten
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string
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subvert
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thaw
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thin(verb, weaken, soften)
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thread
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tidy
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twine
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unbend
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undermine
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undo
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unfasten
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unfix(verb, weaken, soften)
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unravel
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APASmart Define. (2015). stiffen thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/stiffen/thesaurus/antonyms
ChicagoSmart Define. 2015. "stiffen thesaurus" https://smartdefine.org/stiffen/thesaurus/antonyms (accessed September 26, 2026).
HarvardSmart Define 2015, stiffen thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/stiffen/thesaurus/antonyms>.
MLASmart Define. "stiffen thesaurus" 13 April 2015. Web. 26 September 2026. <https://smartdefine.org/stiffen/thesaurus/antonyms>