76 entries under vital topic. ×

32
arduous(adjective, dull, great, tough, severe)
30
laborious(adjective, dull, hard, great, tough)
24
tough(adjective, action, dull, strong, great)
21
difficult(adjective, dull, hard, great, tough)
21
hard(adjective, dull, great, tough, severe)
20
active(adjective, action, strong, tough, difficult)
18
energetic(adjective, action, strong, tough, smart)
16
vigorous(adjective, action, strong, tough, smart)
12
spirited(adjective, strong, tough, difficult, energetic)
12
zealous(adjective, activity, strong, tough, smart)
11
dynamic(adjective, action, strong, tough, smart)
10
forceful(adjective, action, strong, tough, smart)
10
strong(adjective, tough, difficult, energetic, powerful)
9
formidable(adjective, tough, severe, rough, difficult)
8
heavy(adjective, dull, tough, severe, rough)
8
intense(adjective, strong, tough, difficult, harsh)
8
lusty(adjective, strong, tough, intense, energetic)
8
rugged(adjective, action, strong, tough, severe)
7
lively(adjective, action, strong, tough, energetic)
7
operose(adjective, hard, tough, severe, rough)
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APASmart Define. (2016). strenuous thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/strenuous/thesaurus/synonyms
ChicagoSmart Define. 2016. "strenuous thesaurus" https://smartdefine.org/strenuous/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2016, strenuous thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/strenuous/thesaurus/synonyms>.
MLASmart Define. "strenuous thesaurus" 1 April 2016. Web. 27 September 2026. <https://smartdefine.org/strenuous/thesaurus/synonyms>