2
moving(adjective, awful, wonderful, amazing, grand)
2
muscular(adjective, strong)
2
nasty(adjective, bad, hard, rough, difficult)
2
not easy(expression, idiom, difficulty)
2
persuasive(prevailing, influential, commanding)
2
profound(hard, delicate, intense, heavy, complex)
2
remarkable(adjective, great, grand, splendid, fabulous)
2
sinewy(adjective, strong)
2
slavish(adjective, tough, rough, difficult, heavy)
2
stalwart(adjective, prevailing, influential, commanding)
2
striking(awful, wonderful, amazing, grand, splendid)
2
stunning(adjective, awful, wonderful, amazing, grand)
2
stupefying(adjective, awful, wonderful, amazing, grand)
2
telling(prevailing, influential, commanding)
2
tiring(adjective, hard, tough, severe, rough)
2
towering(adjective, great, big, exceptional, marvelous)
2
treacherous(adjective, bad, hard, evil, rough)
2
violent(adjective, hard, severe, rough, difficult)
2
virile(adjective, strong)
1
tight(adjective, difficult)
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APASmart Define. (2015). formidable thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/formidable/thesaurus/synonyms
ChicagoSmart Define. 2015. "formidable thesaurus" https://smartdefine.org/formidable/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, formidable thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/formidable/thesaurus/synonyms>.
MLASmart Define. "formidable thesaurus" 17 July 2015. Web. 21 September 2026. <https://smartdefine.org/formidable/thesaurus/synonyms>