8
severe(adjective, hard, tough, difficult, awkward)
7
big(adjective, importance, valuable, main, notable)
7
big-league(adjective, importance, valuable, main, notable)
7
big shot(adjective, importance, valuable, main, notable)
7
bigwig(adjective, importance, valuable, main, notable)
7
business-minded
7
constitutive(adjective, importance, valuable, main, notable)
7
donnish(adjective, importance, valuable, main, notable)
7
earnest(adjective, importance, valuable, main, notable)
7
essential(adjective, importance, valuable, main, notable)
7
far reaching(adjective, importance, valuable, main, notable)
7
fateful(adjective, importance, valuable, main, notable)
7
grand(adjective, importance, valuable, main, notable)
7
grave(adjective, importance, valuable, main, notable)
7
great(adjective, importance, valuable, main, notable)
7
haughty(adjective, importance, valuable, main, notable)
7
high-up(adjective, importance, valuable, main, notable)
7
impressive(adjective, importance, valuable, main, notable)
7
key(adjective, importance, valuable, main, notable)
7
material(adjective, importance, valuable, main, notable)
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APASmart Define. (2016). challenging thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/challenging/thesaurus/synonyms
ChicagoSmart Define. 2016. "challenging thesaurus" https://smartdefine.org/challenging/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2016, challenging thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/challenging/thesaurus/synonyms>.
MLASmart Define. "challenging thesaurus" 2 March 2016. Web. 22 September 2026. <https://smartdefine.org/challenging/thesaurus/synonyms>