50 entries under adjective topic. ×

2
tenacious(strong, firm, determined, steady)
2
tireless(strong, keen, firm, lively)
2
unfailing(strong, firm, determined, steady)
2
unfaltering(strong, firm, determined, steady)
2
unflagging(strong, firm, determined, active)
2
unflinching(strong, firm, determined, steady)
2
unremitting(strong, firm, determined, steady)
2
unswerving(strong, firm, determined, steady)
2
unwavering(strong, firm, determined, steady)
2
unwearied(strong, firm, determined, steady)
1
chinking
1
continued(strong, firm, determined, steady)
1
dedicated(strong, firm, determined, steady)
1
devoted(strong, firm, determined, steady)
1
eager beaver(expression, strong, firm, determined)
1
fireball(strong, firm, determined, steady)
1
firm(strong, determined, steady, constant)
1
go-go(strong, firm, determined, steady)
1
incessant(strong, firm, determined, steady)
1
inexhaustible(strong, firm, determined, steady)
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APASmart Define. (2015). plugging thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/plugging/thesaurus/synonyms
ChicagoSmart Define. 2015. "plugging thesaurus" https://smartdefine.org/plugging/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, plugging thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/plugging/thesaurus/synonyms>.
MLASmart Define. "plugging thesaurus" 10 April 2015. Web. 20 September 2026. <https://smartdefine.org/plugging/thesaurus/synonyms>