150 entries under adjective topic. ×

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comme il faut(expression, modest, polite, decent)
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conforming(modest, polite, decent, moral)
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correct(polite, decent, clay, mannerly)
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de rigueur(expression, modest, polite, decent)
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demure(modest, polite, decent, moral)
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dense(strong, hard, tough, sturdy)
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fair and square(honest, just)
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ferric(strong, hard, tough, sturdy)
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ferrous(strong, hard, tough, sturdy)
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firm(strong, hard, tough, severe)
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forceful(severe, stiff, tight, strict)
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genteel(modest, polite, decent, moral)
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hard to please(expression, idiom, painstaking)
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heavy(strong, hard, tough, sturdy)
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immovable(strong, hard, tough, sturdy)
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indomitable(strong, hard, tough, sturdy)
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insensible(strong, hard, tough, sturdy)
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ironfisted(stiff, strict, demanding, disciplined)
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kosher(modest, polite, decent, moral)
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mannerly(modest, polite, decent, moral)
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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>