Unfaithful Definition

Failing to observe the terms of a vow, promise, understanding, etc., or false to allegiance or duty; faithless; disloyal.
Webster's New World
Not true, accurate, or reliable; untrustworthy.
Webster's New World
Engaging in sexual relations with someone other than one's spouse, lover, etc.; adulterous.
Webster's New World
Not justly representing or reflecting the facts or a primary source; inaccurate.
An account that was unfaithful to what really happened; a translation that was unfaithful to the original.
American Heritage
Lacking good faith; dishonest.
Webster's New World

Origin of Unfaithful

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