121 entries under challenge topic. ×

20
attack(verb, charge, attack, criticize, dispute)
13
criticize(verb, charge, attack, dispute, scorn)
12
assail(verb, attack, criticize, dispute)
10
dispute(verb, get, check, oppose, criticize)
10
gainsay(verb, break, check, reject, disregard)
9
deny(verb, check, reject, oppose, criticize)
9
oppose(verb, break, check, disregard, criticize)
8
question(verb, get, charge, criticize, dispute)
8
traverse(verb, break, check, disregard, oppose)
7
contradict(verb, break, check, reject, disregard)
7
doubt(verb, dispute, deny, question)
7
negate(verb, break, check, reject, disregard)
6
cross(verb, break, get, disregard, oppose)
6
knock(verb, charge, attack, criticize, dispute)
5
contest(verb, check, resist, deny)
5
call in question(verb, expression, idiom, oppose, dispute)
5
call into question(verb, expression, idiom, charge, oppose)
5
contravene(verb, break, check, disregard, oppose)
5
controvert(verb, oppose, dispute, deny)
5
disprove(verb, oppose, deny, question)
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APASmart Define. (2015). impugn thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/impugn/thesaurus/synonyms
ChicagoSmart Define. 2015. "impugn thesaurus" https://smartdefine.org/impugn/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, impugn thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/impugn/thesaurus/synonyms>.
MLASmart Define. "impugn thesaurus" 10 April 2015. Web. 24 September 2026. <https://smartdefine.org/impugn/thesaurus/synonyms>