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somber
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somberly
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sourly
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sternly
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strictly
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threaten
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threatening
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ugly
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uncannily
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uncomely
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unfortunately
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ungainly
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unhandsomely
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unhappily
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unluckily
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unpropitious
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unreadily
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untowardly
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viperously
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wretched
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APASmart Define. (2016). sinisterly thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/sinisterly/thesaurus/related
ChicagoSmart Define. 2016. "sinisterly thesaurus" https://smartdefine.org/sinisterly/thesaurus/related (accessed September 25, 2026).
HarvardSmart Define 2016, sinisterly thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/sinisterly/thesaurus/related>.
MLASmart Define. "sinisterly thesaurus" 24 March 2016. Web. 25 September 2026. <https://smartdefine.org/sinisterly/thesaurus/related>