69 entries under firm topic. ×

3
unflinching(adjective, strong, energetic, determined)
3
unremitting(adjective, strong, energetic, determined)
2
balky(tough, unreasonable, grim, inflexible)
2
continuing(adjective, strong, determined, steady)
2
incompliant(adjective, tough, difficult, awkward)
2
plugging(adjective, strong, determined, active)
2
rebellious(adjective, tough, unreasonable, grim)
2
unwearied(adjective, strong, energetic, determined)
1
cantankerous(mean, tough, difficult, awkward)
1
continued(adjective, strong, determined, steady)
1
cussed(mean, tough, cross, unreasonable)
1
eager beaver(expression, adjective, strong, determined)
1
fireball(adjective, strong, determined, steady)
1
go-go(adjective, strong, determined, steady)
1
grind(adjective, strong, determined, active)
1
hard-line(tough, difficult, determined, awkward)
1
incessant(adjective, strong, determined, steady)
1
inexhaustible(adjective, strong, energetic, determined)
1
insubordinate(tough, unreasonable, grim, inflexible)
1
ornery(mean, tough, cross, unreasonable)
11 years ago|8k views|share |citing 
APASmart Define. (2015). pertinacious thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/pertinacious/thesaurus/synonyms
ChicagoSmart Define. 2015. "pertinacious thesaurus" https://smartdefine.org/pertinacious/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, pertinacious thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/pertinacious/thesaurus/synonyms>.
MLASmart Define. "pertinacious thesaurus" 10 April 2015. Web. 25 September 2026. <https://smartdefine.org/pertinacious/thesaurus/synonyms>