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

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