4
difficult(adjective, hard, tough, severe, rough)
4
diligent(adjective, careful, thorough, meticulous, vigilant)
4
direct
4
discriminating(adjective, correct, sharp, obscure, fine)
4
domineering
4
forbidding(adjective, strong, hard, tough, severe)
4
free from error(adjective, exact, scrupulous, detailed)
4
free from mistakes(adjective, exact, scrupulous, detailed)
4
free from vagueness(adjective, exact, scrupulous, detailed)
4
hard-and-fast(adjective, hard, rigid, inflexible, obstinate)
4
hard-line(adjective, strong, hard, tough, severe)
4
hard and fast(expression, adjective, idiom, set, solid)
4
imperative
4
imperious
4
intense(adjective, severe)
4
intractable(adjective, hard, persistent, rigid, obstinate)
4
mathematical
4
perfectionist(adjective, careful, thorough, scrupulous, detailed)
4
picky(adjective, severe, firm, harsh, careful)
4
positive(certain, definite, flawless, faultless, severity)
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APASmart Define. (2015). strict thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/strict/thesaurus/synonyms
ChicagoSmart Define. 2015. "strict thesaurus" https://smartdefine.org/strict/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, strict thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/strict/thesaurus/synonyms>.
MLASmart Define. "strict thesaurus" 3 August 2015. Web. 21 September 2026. <https://smartdefine.org/strict/thesaurus/synonyms>