3
raise a howl(expression, idiom)
3
rally(noun, verb, support, disturb, touch)
3
refusal
3
refutation(noun, disputation, confutation)
3
repeal(noun, verb, confutation, confute)
3
repel(verb, meet, attack, disregard, oppose)
3
repudiation(noun, disagreement, confutation)
3
repulsion(noun, opposition)
3
resistance(noun, opposition)
3
scruple(noun, verb, dispute, dislike, object)
3
seek(verb, go, promote, examine, exact)
3
stimulate(verb, disturb, touch, promote, encourage)
3
stir(verb, disturb, start, promote, encourage)
3
strive(verb, meet, attack, play, fight)
3
struggle(verb, meet, attack, play, fight)
3
summons(order, disregard, command, demand, offer)
3
take on(verb, expression, take, meet, oppose)
3
tell off(verb, expression, take, meet, oppose)
3
threaten(oppose, provoke, weaken, resist, defy)
3
throw down the gauntlet(verb, expression, idiom, oppose, fight)
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APASmart Define. (2016). challenge thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/challenge/thesaurus/synonyms
ChicagoSmart Define. 2016. "challenge thesaurus" https://smartdefine.org/challenge/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2016, challenge thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/challenge/thesaurus/synonyms>.
MLASmart Define. "challenge thesaurus" 1 April 2016. Web. 22 September 2026. <https://smartdefine.org/challenge/thesaurus/synonyms>