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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.
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References in periodicals archive ?
I do not wish to appear here in any fault-finding spirit, or as an impugner of the motives of those who believe that the time has come for this Society to disband.
The rabid anti-Semite Leon de Castro, professor of Greek at Salamanca and one of fray Luis' principal impugners, invoked such arguments to lash against "Iudaei & Iudaizantes" as he defended the superiority of the Vulgate and the Septuagint over the Hebrew Bible (Thompson 1988, 47ff).