impugner


im·pugn

I0069200 (ĭm-pyo͞on′)tr.v. im·pugned, im·pugn·ing, im·pugns To attack as false or questionable; challenge in argument: impugn a political opponent's record.
[Middle English impugnen, from Old French impugner, from Latin impugnāre : in-, against; see in-2 + pugnāre, to fight; see peuk- in Indo-European roots.]
im·pugn′a·ble adj.im·pugn′er n.