Impugnable

im·pugn  (m-pyn)

tr.v. im·pugned, im·pugn·ing, im·pugns

To attack as false or questionable; challenge in argument: impugn a political opponent's record.

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[Middle English impugnen, from Old French impugner, from Latin impugnre : in-, against; see in-² + pugnre, to fight; see peuk- in Indo-European roots.]

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im·pugna·ble adj.

im·pugner n.

Thesaurus

Adj.

1.

impugnable - subject to being discredited questionable - subject to question; "questionable motives"; "a questionable reputation"; "a fire of questionable origin"