資料來源 : pyDict

可責難的,可抨擊的

資料來源 : Webster's Revised Unabridged Dictionary (1913)

Impugnable \Im*pugn"a*ble\, a.
   Capable of being impugned; that may be gainsaid.

資料來源 : WordNet®

impugnable
     adj : subject to being discredited