906 entries under adjective topic. ×

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muffled(quiet, soft, dark, cold)
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muted(dull, quiet, soft, obscure)
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pale(dull, dark, gloomy, faint)
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pallid(pale, neutral)
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passive(calm, dull, indifferent, unconcerned)
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perfect(complete, big, limited, utter)
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phlegmatic(calm, quiet, tough, indifferent)
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precise(calm, smooth, plain, level)
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punctured(smooth, level)
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quiet(soft, gentle, slow, level)
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reclining(smooth, level, even, lying)
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sapless(dull, weak, thin, delicate)
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savourless
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shallow
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sharp(noun, hard, severe, rough)
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sour(hard, severe, sharp, rough)
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stable(calm, quiet, strong, direct)
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sterile(dull, excite, poor, boring)
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stodgy
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tiring(dull, stupid, boring, tedious)
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APASmart Define. (2016). flat thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/flat/thesaurus/synonyms
ChicagoSmart Define. 2016. "flat thesaurus" https://smartdefine.org/flat/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2016, flat thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/flat/thesaurus/synonyms>.
MLASmart Define. "flat thesaurus" 1 March 2016. Web. 22 September 2026. <https://smartdefine.org/flat/thesaurus/synonyms>