Definition of unimpeachable
: not impeachable: such as
a
: reliable beyond a doubt
unimpeachable evidence an unimpeachable source
b
: not liable to accusation : irreproachable
an unimpeachable reputation
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Merriam-Webster unabridged
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Time Traveler for unimpeachable
The first known use of unimpeachable was in 1784
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