noun treachery; deceit; perfidy; unfaithfulness.
2. falsehood ·noun a counterfeit; a false appearance; an imposture.
3. falsehood ·noun want of truth or accuracy; an untrue assertion or representation; error; misrepresentation; falsity.
4. falsehood ·noun a deliberate intentional assertion of what is known to be untrue; a departure from moral integrity; a lie.