Dictionary

unimpeachable

adjective un·im·peach·able \ˌən-im-ˈpē-chə-bəl\

: very reliable and trusted : not able to be doubted or questioned

Full Definition of UNIMPEACHABLE

:  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 \-blē\ adverb

Examples of UNIMPEACHABLE

  1. a person of unimpeachable integrity
  2. The information is from an unimpeachable source.

First Known Use of UNIMPEACHABLE

1784

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