2
stickler(adjective, thorough, meticulous, painstaking)
2
stout
2
sturdy(adjective, strong, tough, intense, energetic)
2
tenacious
2
terrible(adjective, tough, rough, difficult, intense)
2
thoroughgoing(adjective, thorough, meticulous, painstaking)
2
titanic(tough, severe, painful, problematic, trying)
2
toilful(adjective, tough, rough, difficult, heavy)
2
unflagging(adjective, strong, difficult, energetic, lively)
2
unsparing(adjective, tough, rough, difficult, harsh)
2
violent(difficult, stressful)
2
virile(adjective, vigorous)
2
vivacious(adjective, strong, moving, energetic, lively)
1
ablaze(adjective, vigorous)
1
abstruse
1
accent
1
action
1
activating(adjective, energetic, lively, active, vigorous)
1
acute
1
adverse(adjective, difficult)
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APASmart Define. (2016). strenuous thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/strenuous/thesaurus/synonyms
ChicagoSmart Define. 2016. "strenuous thesaurus" https://smartdefine.org/strenuous/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2016, strenuous thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/strenuous/thesaurus/synonyms>.
MLASmart Define. "strenuous thesaurus" 1 April 2016. Web. 23 September 2026. <https://smartdefine.org/strenuous/thesaurus/synonyms>