175 entries under doubt topic. ×

4
interrogate(verb, order, force, press, examine)
4
kick(noun, verb, phrasal verb, support, act)
4
protestation(noun, support, act, dislike)
4
refute(verb, oppose, deny, question)
4
squawk(noun, verb, phrasal verb, support, act)
4
suspect(verb, dispute, question, hesitate)
4
traverse(verb, support, take, meet, attack)
3
catechize(verb, examine, demand, request)
3
combat(noun, verb, meet, oppose, fight)
3
demurral(noun, issue, dislike, opposition)
3
disapprove(verb, oppose, criticize, dislike, condemn)
3
disprove(verb, oppose, dislike, condemn, blame)
3
hit up(verb, expression, state, hold, take)
3
knock(noun, verb, state, hold, take)
3
scruple(noun, verb, dispute, dislike, object)
3
take on(verb, expression, take, meet, oppose)
2
altercate(verb, meet, attack, dispute, struggle)
2
balk(verb, oppose, criticize, ignore, dispute)
2
be dubious(verb, dispute, question, hesitate)
2
be uncertain(verb, dispute, question, hesitate)
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APASmart Define. (2016). challenge thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/challenge/thesaurus/synonyms
ChicagoSmart Define. 2016. "challenge thesaurus" https://smartdefine.org/challenge/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2016, challenge thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/challenge/thesaurus/synonyms>.
MLASmart Define. "challenge thesaurus" 1 April 2016. Web. 23 September 2026. <https://smartdefine.org/challenge/thesaurus/synonyms>