Synonyms|768Antonyms|230|Broader|9Narrower|0Related|1.3k

416 entries under adjective topic. ×

7
effortful(tough, severe, difficult, heavy)
7
fierce(great, tough, heavy, horrible)
7
ghastly(bad, terrible, fear, shocking)
7
great(tough, difficult, big, large)
7
overwhelming(great, tough, awful, grand)
6
rugged(hard, severe, evil, rough)
6
staggering(difficult, overwhelming)
6
challenging(tough, severe, difficult, awkward)
6
dangerous(hard, tough, severe, evil)
6
grim(appearance, bad, severe, manner)
6
horrifying(awful, terrible, wonderful, grand)
6
knotty(hard, severe, rough, difficult)
6
operose(tough, severe, difficulty, rough)
6
potent(strong, prevailing, influential, commanding)
6
serious(bad, hard, difficult, unpleasant)
6
thorny(bad, difficult, delicate, complex)
6
threatening(tough, severe, unpleasant, important)
6
trying(tough, severe, rough, difficult)
6
vigorous(strong, prevailing, influential, commanding)
6
weighty(severe, harsh, heavy, painful)
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APASmart Define. (2015). formidable thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/formidable/thesaurus/synonyms
ChicagoSmart Define. 2015. "formidable thesaurus" https://smartdefine.org/formidable/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, formidable thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/formidable/thesaurus/synonyms>.
MLASmart Define. "formidable thesaurus" 17 July 2015. Web. 22 September 2026. <https://smartdefine.org/formidable/thesaurus/synonyms>