127 entries under persistent topic. ×

12
hanging tough(expression, adjective, mean, hard, determined)
12
intractable(adjective, tough, firm, obstinate)
10
remorseless(adjective, harsh, resist, cruel, determined)
10
unswerving(adjective, complete, total, intense, determined)
9
contrary(adjective, determined, resolute, obstinate)
9
die-hard(adjective, resist, determined, resolute)
9
undeviating(adjective, severe, harsh, cruel, determined)
8
brassbound(adjective, resist, determined, resolute)
8
narrow-minded(adjective, obstinate, insistent, dogged)
8
single-minded(adjective, tough, severe, firm, harsh)
7
cruel(adjective, strong, hard, tough, severe)
7
hard-line(adjective, strong, hard, tough, severe)
6
changeless(adjective, set, severe, firm, still)
6
persevering(adjective, tough, firm, determined, unreasonable)
6
pitiless(adjective, severe, harsh, cruel, determined)
5
faithful(adjective, correct, solid, intense, exact)
5
immobile(adjective, secure, intense, still, steady)
5
staunch(adjective, set, hard, determined, resolute)
4
contumacious(adjective, tough, firm, obstinate)
4
indomitable(adjective, strong, hard, tough, resolute)
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APASmart Define. (2015). rigid thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/rigid/thesaurus/synonyms
ChicagoSmart Define. 2015. "rigid thesaurus" https://smartdefine.org/rigid/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, rigid thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/rigid/thesaurus/synonyms>.
MLASmart Define. "rigid thesaurus" 3 August 2015. Web. 21 September 2026. <https://smartdefine.org/rigid/thesaurus/synonyms>