279 entries under adjective topic. ×

10
exacting(dull, tough, severe, rough)
10
forceful(action, strong, tough, smart)
10
industrious(strong, difficult, lively, determined)
10
strong(tough, difficult, energetic, powerful)
9
earnest(energetic, vigorous, zealous, thorough)
9
formidable(tough, severe, rough, difficult)
9
uphill(hard, great, tough, severe)
9
wearisome(dull, tough, severe, difficult)
8
busy
8
gruelling
8
heavy(dull, tough, severe, rough)
8
intense(strong, tough, difficult, harsh)
8
lusty(strong, tough, intense, energetic)
8
persistent(energetic, zealous, perseverance)
8
rugged(action, strong, tough, severe)
8
severe(tough, rough, difficult, harsh)
8
tireless(strong, difficult, energetic, lively)
8
trying(dull, tough, severe, rough)
8
wearying(dull, difficult, awkward, boring)
7
determined(energetic, zealous)
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APASmart Define. (2016). strenuous thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/strenuous/thesaurus/synonyms
ChicagoSmart Define. 2016. "strenuous thesaurus" https://smartdefine.org/strenuous/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2016, strenuous thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/strenuous/thesaurus/synonyms>.
MLASmart Define. "strenuous thesaurus" 1 April 2016. Web. 24 September 2026. <https://smartdefine.org/strenuous/thesaurus/synonyms>