906 entries under adjective topic. ×

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blind(dull, lackluster)
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blunt
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calm(cool, weak, kind, smooth)
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collapsed(smooth, level)
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common(noun, calm, dull, set)
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consistent(calm, strong, direct, smooth)
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constant(calm, strong, smooth, right)
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deadened(quiet, stifled, non-resonant)
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dingy(dull, soft, obscure, dark)
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dismal(dull, soft, obscure, dark)
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dry-as-dust
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equal
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extended(smooth, level)
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flattened(smooth, leveled)
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hard(dull, severe, sharp, rough)
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indifferent(calm, dull, quiet, cool)
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innocuous(dull, lackluster, harmless)
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insolvent(poor, low, exhausted, meager)
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invariable(quiet, soft, gentle, level)
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lying
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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>