Impugn
Impugn , transitive verb
[Old English impugnen, French impugner, from Latin impugnare; in on, against + pugnare to flight. See Pugnacious.]
To attack by words or arguments; to contradict; to assail; to call in question; to make insinuations against; to gainsay; to oppose; as, to impugn a person's integrity.
The truth hereof I will not rashly impugn, or overboldly affirm.