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English word liar comes from Proto-Indo-European *lewgʰ-, and later Proto-Germanic *leuganą (To lie, to tell a falsehood.)
*lewgʰ- (Proto-Indo-European)
to tell a lie
*leuganą (Proto-Germanic)
To lie, to tell a falsehood.
lēogan (Old English)
lēogere (Old English)
lier (Middle English)
liar (English)
One who tells lies.