174 entries under adjective topic. ×

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secret(evil, mysterious, threatening, nefarious)
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sinful(evil, mysterious, threatening, nefarious)
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steel(strong, hard, tough, sturdy)
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stern-visaged
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strait-laced
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strict(strong, hard, tough, severe)
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strong(hard, tough, sturdy, rugged)
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sturdy(strong, hard, tough, rugged)
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thick(strong, hard, tough, sturdy)
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unbending(strong, hard, tough, sturdy)
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uncompromising
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unyielding(strong, hard, tough, severe)
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vile(evil, mysterious, threatening, nefarious)
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wicked(evil, mysterious, threatening, nefarious)
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APASmart Define. (2015). frowning thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/frowning/thesaurus/synonyms
ChicagoSmart Define. 2015. "frowning thesaurus" https://smartdefine.org/frowning/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, frowning thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/frowning/thesaurus/synonyms>.
MLASmart Define. "frowning thesaurus" 10 April 2015. Web. 24 September 2026. <https://smartdefine.org/frowning/thesaurus/synonyms>