7
businesslike(adjective, exact, strict, scrupulous, detailed)
7
clockwork(adjective, exact, strict, scrupulous, detailed)
7
concise(adjective, exact, strict, scrupulous, detailed)
7
critical(adjective, severe, harsh, precise, rigid)
7
definitive(adjective, exact, strict, scrupulous, detailed)
7
detailed(adjective, close, correct, solid, exact)
7
dour(adjective, tough, severe, firm, harsh)
7
exigent(adjective, difficult, heavy, severity, taxing)
7
explicative(adjective, exact, strict, scrupulous, detailed)
7
finicky(adjective, harsh, thoughtful, precise, sober)
7
firm(noun, adjective, strong, hard, complete)
7
free from error(adjective, exact, strict, scrupulous, detailed)
7
free from mistakes(adjective, exact, strict, scrupulous, detailed)
7
free from vagueness(adjective, exact, strict, scrupulous, detailed)
7
grim(adjective, strong, hard, tough, severe)
7
inexorable(adjective, strong, hard, tough, severe)
7
laborious(adjective, hard, tough, severe, rough)
7
letter-perfect(adjective, exact, strict, scrupulous, detailed)
7
literal(noun, adjective, correct, solid, perfect)
7
obstinate(adjective, hard, severe, resolute, rigid)
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APASmart Define. (2016). rigorous thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/rigorous/thesaurus/synonyms
ChicagoSmart Define. 2016. "rigorous thesaurus" https://smartdefine.org/rigorous/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2016, rigorous thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/rigorous/thesaurus/synonyms>.
MLASmart Define. "rigorous thesaurus" 26 February 2016. Web. 21 September 2026. <https://smartdefine.org/rigorous/thesaurus/synonyms>