Definition of unfaithful
: not faithful:
a : not adhering to vows, allegiance, or duty : disloyal an unfaithful friend
b : not faithful to marriage vows
suspected her husband of being unfaithful
c : inaccurate, untrustworthy an unfaithful copy of a document
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Time Traveler for unfaithful
The first known use of unfaithful was in the 15th century
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