150 entries under adjective topic. ×

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straight(modest, polite, decent, prim)
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strait-laced(solid, modest, polite, decent)
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strong(hard, tough, sturdy, rugged)
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stuffy(solid, modest, polite, decent)
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sturdy(strong, hard, tough, rugged)
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systematical
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thick(strong, hard, tough, sturdy)
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tight(severe, stiff, rigid, strict)
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unbending(strong, hard, tough, sturdy)
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unyielding(strong, hard, tough, severe)
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APASmart Define. (2013). by the book thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/by_the_book/thesaurus/synonyms
ChicagoSmart Define. 2013. "by the book thesaurus" https://smartdefine.org/by_the_book/thesaurus/synonyms (accessed September 30, 2026).
HarvardSmart Define 2013, by the book thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/by_the_book/thesaurus/synonyms>.
MLASmart Define. "by the book thesaurus" 19 May 2013. Web. 30 September 2026. <https://smartdefine.org/by_the_book/thesaurus/synonyms>