impugn - definition and synonyms

verb [transitive] very formal 

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/ɪmˈpjuːn/
present tense
I/you/we/theyimpugn
he/she/itimpugns
present participleimpugning
past tenseimpugned
past participleimpugned
  1. if you impugn someone’s motives, you say that they do not deserve to be trusted or respected