74 entries under rigid topic. ×

5
oppressive(adjective, hard, tough, severe, rough)
5
powerful(verb, adjective, good, strong, sound)
5
rough(adjective, hard, severe, difficult, bleak)
5
unsparing(adjective, tough, severe, firm, harsh)
5
valid(verb, adjective, sound, right, reasonable)
3
compelling(adjective, good, strong, sound, reasonable)
3
confining(adjective, tight)
3
drawing(adjective, tight)
3
strait-laced(adjective, tough, severe, firm, harsh)
2
firm(noun, adjective, set, hard, tough)
2
hard-nosed(adjective, hard, severe, sharp, nasty)
2
obstinate(adjective, set, hard, severe, stiff)
2
picky(adjective, tough, severe, firm, harsh)
2
prudish(adjective, tough, severe, firm, harsh)
2
puritanical(adjective, tough, severe, firm, harsh)
2
set(adjective, tough, severe, firm, harsh)
2
weighty(adjective, good, strong, hard, sound)
1
adamantine(adjective, hard, severe, stiff, resolute)
1
by the book(adjective, tight)
1
dead set(expression, adjective, tough, severe, firm)
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APASmart Define. (2015). stringent thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/stringent/thesaurus/synonyms
ChicagoSmart Define. 2015. "stringent thesaurus" https://smartdefine.org/stringent/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, stringent thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/stringent/thesaurus/synonyms>.
MLASmart Define. "stringent thesaurus" 14 April 2015. Web. 22 September 2026. <https://smartdefine.org/stringent/thesaurus/synonyms>