55 entries under terrible topic. ×

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implacable(appearance, hopeless)
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inexorable(appearance, hopeless)
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intractable(appearance, hopeless)
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overwhelming(awful, dreadful)
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redoubtable(awful, dreadful)
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relentless(appearance, hopeless)
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resolute(appearance, hopeless)
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shuddersome(nasty, awful, dreadful, disturbing)
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splenetic(appearance, hopeless)
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sublime(awful, dreadful)
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tremendous(awful, dreadful)
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truculent(adjective, appearance, unpleasant, horrible)
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unrelenting(appearance, hopeless)
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unspeakable(awful, dreadful)
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unyielding(appearance, hopeless)
<123>
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APASmart Define. (2016). sinister thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/sinister/thesaurus/synonyms
ChicagoSmart Define. 2016. "sinister thesaurus" https://smartdefine.org/sinister/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2016, sinister thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/sinister/thesaurus/synonyms>.
MLASmart Define. "sinister thesaurus" 3 April 2016. Web. 27 September 2026. <https://smartdefine.org/sinister/thesaurus/synonyms>