1
preoccupied
1
punctilious
1
purposive
1
pushy
1
rapt
1
red-blooded(adjective, strong, moving, energetic, lively)
1
reliable(adjective, resolute)
1
rigid
1
rugged(adjective, strong, moving, lively, active)
1
sagging
1
scrupulous
1
serious(adjective, resolute)
1
sleepless
1
slogging
1
snappy(adjective, strong, moving, energetic, lively)
1
spry(adjective, strong, moving, energetic, lively)
1
steely(adjective, resolute)
1
stern(adjective, resolute)
1
sticky
1
stony(adjective, tenacious)
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APASmart Define. (2016). tireless thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/tireless/thesaurus/synonyms
ChicagoSmart Define. 2016. "tireless thesaurus" https://smartdefine.org/tireless/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2016, tireless thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/tireless/thesaurus/synonyms>.
MLASmart Define. "tireless thesaurus" 19 February 2016. Web. 25 September 2026. <https://smartdefine.org/tireless/thesaurus/synonyms>