68 entries under terrible topic. ×

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abysmal(awful, dreadful)
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appearance
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austere(appearance, severe, harsh, heavy)
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baleful(awful, dreadful)
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barbarous(appearance, hopeless)
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bleak(appearance, hopeless)
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bloodcurdling(awful, dreadful)
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dogged(appearance, hopeless)
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foreboding(appearance, hopeless)
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funereal(appearance, hopeless)
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glowering(appearance, hopeless)
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hopeless
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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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relentless(appearance, hopeless)
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resolute(appearance, hopeless)
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scowling(adjective, appearance, unpleasant, horrible)
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shuddersome(bad, awful, horrible, rotten)
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somber(appearance, hopeless)
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APASmart Define. (2015). formidable thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/formidable/thesaurus/synonyms
ChicagoSmart Define. 2015. "formidable thesaurus" https://smartdefine.org/formidable/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, formidable thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/formidable/thesaurus/synonyms>.
MLASmart Define. "formidable thesaurus" 17 July 2015. Web. 24 September 2026. <https://smartdefine.org/formidable/thesaurus/synonyms>