" impugn "

1: to criticize (a person's character, intentions, etc.) by suggesting that someone is not honest and should not be trusted;

  * e.g., " ... He impugned his rival's character. "

•  Synonyms : 

•  blame,

•  call (on),

•  castigate,

•  censure,

•  condemn,

•  criticize,

•  damn,

•  denounce,

•  fault,

•  reproach,

•  reprobate,

•  accuse,

•  charge,

•  criminate,

•  defame,

•  impeach,

•  incriminate,

•  indict,

•  chide,

•  rebuke,

•  reprove,

•  tax,

•  appeal,

•  arraign,

•  book,

•  cite,

•  summon,

•  prosecute,

•  sue,

•  try,

•  frame,

•  implicate,

•  inculpate,

•  inform (against),

•  name,

•  report,

•  recriminate,

•  retaliate

•  Antonyms : 

•  advocate,

•  champion,

•  defend,

•  excuse,

•  forgive,

•  justify,

•  pardon,

•  remit,

•  shrive,

•  absolve,

•  acquit,

•  clear,

•  exculpate,

•  exonerate,

•  vindicate