Definition of impugn verb from the Oxford Advanced American Dictionary

     

    impugn

     verb
    verb
    NAmE//ɪmˈpyun//
     
    impugn something(formal)Verb Forms present simple I / you / we / they impugn
     
    he / she / it impugns
     
    past simple impugned
     
    -ing form impugning
     
     
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  1. 1to express doubts about whether something is right, honest, etc. synonym challenge
  2. 2 There were no real grounds for impugning the decision.
See the Oxford Advanced Learner's Dictionary entry: impugn