1
resigned(adjective, calm, quiet, gentle, restrained)
1
resistant
1
ropy
1
rugged(adjective, strong, moving, lively, active)
1
self-possessed(adjective, calm, quiet, gentle, restrained)
1
serene(adjective, calm, quiet, gentle, restrained)
1
set
1
sinewy
1
sleepless
1
slogging
1
snappy(adjective, strong, moving, energetic, lively)
1
sprightly(adjective, strong, moving, energetic, lively)
1
spry(adjective, strong, moving, energetic, lively)
1
stable
1
stiff
1
stoical(adjective, calm, quiet, understanding, gentle)
1
strenuous(adjective, strong, moving, energetic, lively)
1
stringy
1
submissive(adjective, calm, quiet, understanding, gentle)
1
thorough
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APASmart Define. (2015). untiring thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/untiring/thesaurus/synonyms
ChicagoSmart Define. 2015. "untiring thesaurus" https://smartdefine.org/untiring/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, untiring thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/untiring/thesaurus/synonyms>.
MLASmart Define. "untiring thesaurus" 14 April 2015. Web. 24 September 2026. <https://smartdefine.org/untiring/thesaurus/synonyms>