Synonyms|266Antonyms|6|Broader|1Narrower|4Related|4

32 entries under rigorous topic. ×

2
by the numbers(noun, expression, adjective, idiom, adverb)
1
acrimonious(adjective, severe, harsh, stiff, rigid)
1
binding(adjective, severe, harsh, stiff, rigid)
1
brick-wall(adjective, severe, stiff, rigid, tight)
1
careful(adjective, harsh, exact, regular, neat)
1
compelling(adjective, severe, harsh, stiff, rigid)
1
confining(adjective, severe, harsh, stiff, rigid)
1
convincing(adjective, severe, harsh, stiff, rigid)
1
dead set on(expression, adjective, idiom, severe, stiff)
1
demanding(adjective, severe, harsh, stiff, rigid)
1
drawing(adjective, severe, harsh, stiff, rigid)
1
dyed-in-the-wool(adjective, strong, hard, tough, severe)
1
hard(adjective, strong, tough, severe, harsh)
1
hard-nosed(adjective, strong, hard, tough, severe)
1
harsh(adjective, strong, hard, tough, severe)
1
inflexible(adjective, strong, hard, tough, severe)
1
iron-fisted(adjective, severe, harsh, stiff, rigid)
1
ironclad(adjective, severe, harsh, stiff, rigid)
1
painstaking(adjective, harsh, exact, careful, neat)
1
poignant(adjective, severe, harsh, stiff, rigid)
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APASmart Define. (2013). by the book thesaurus. Retrieved September 28, 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 28, 2026).
HarvardSmart Define 2013, by the book thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/by_the_book/thesaurus/synonyms>.
MLASmart Define. "by the book thesaurus" 19 May 2013. Web. 28 September 2026. <https://smartdefine.org/by_the_book/thesaurus/synonyms>