adj.
Pronunciation: ˌ ə n-im- ' p ē -ch ə -b ə l
Function: adjective
Date: 1784
: not impeachable: as a : reliable beyond a doubt < unimpeachable evidence> <an unimpeachable source> b : not liable to accusation : IRREPROACHABLE <an unimpeachable reputation>
– un · im · peach · ably \ -bl ē \ adverb