1,185 entry under adjective topic. ×

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foggy(obscure, dark, heavy, gloomy)
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frigid(calm, flat, cold, unemotional)
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grimy(flat, dark, gloomy, dirty)
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homely(simple, plain, pure, common)
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imbecilic(simple, slow, foolish, stupid)
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matter-of-fact(calm, simple, excite, plain)
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mediocre(average, incompetence, dullard, mean)
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neutral(flat, grim, pale, sluggish)
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placid(calm, quiet, kind, smooth)
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poor(light, soft, weakness, thin)
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simple-minded(simple, ability, slow, silly)
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somnolent(noun, careless, relaxed, indifferent)
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sooty(dark, gloomy, dim, black)
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stagnant(quiet, hard, flat, warm)
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stock(set, flat, silly, common)
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stodgy(flat, excite, warm, plain)
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stupefied(simple, slow, stupid, trivial)
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subfusc(gloomy, gray, drab, cloudy)
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undistinguished(ordinary, incompetence, dullard, simple)
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unperceptive(see, senseless, blind, obtuse)
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APASmart Define. (2016). dull thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/dull/thesaurus/synonyms
ChicagoSmart Define. 2016. "dull thesaurus" https://smartdefine.org/dull/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2016, dull thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/dull/thesaurus/synonyms>.
MLASmart Define. "dull thesaurus" 29 March 2016. Web. 26 September 2026. <https://smartdefine.org/dull/thesaurus/synonyms>