v.
Pronunciation: im- ' pyün
Function: transitive verb
Etymology: Middle English, from Anglo-French empugner, from Latin inpugnare, from in- + pugnare to fight ― more at PUNGENT
Date: 14th century
1 : to assail by words or arguments : oppose or attack as false or lacking integrity < impugn ed the defendant's character>
2 obsolete a : ASSAIL b : RESIST
– im · pugn · able \ - ' pyü-n ə -b ə l \ adjective
– im · pugn · er \ -n ə r \ noun