Plural of falsehood: lies, untruths, or statements that are deliberately or factually incorrect.
From false + -hood (Old English -had meaning state or condition). 'Falsehood' emerged in Middle English as a parallel to 'likelihood,' using -hood to make abstract nouns from adjectives.
Interestingly, 'falsehood' is older than 'lie' as a formal term in English—medieval writers often used 'falsehood' for anything untrue, whether intentional lies or simple errors.
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