untrue

Etymology

From Middle English untrewe, from Old English untrīewe, from Proto-West Germanic *untriuwī, from Proto-Germanic *untriwwiz. Equivalent to un- + true.

adj

1. False; not true.
   She says that I stole her necklace, but that's completely untrue.
   I know it is true, for an untrue word never passed her lips. 1886, Peter Christen Asbjørnsen, translated by H.L. Brækstad, Folk and Fairy Tales, page 11
   This statement is untrue. 2004, George Carlin, When Will Jesus Bring the Pork Chops?, New York: Hyperion Books, →OCLC, →OL, page 264
2. Not faithful or loyal.
   Now you say you're sorry / For being so untrue / Well, you can cry me a river, cry me a river 1953, Arthur Hamilton (lyrics and music), “Cry Me a River”
   Let me be the one you come running to / I'll never be untrue 1971, “Let's Stay Together”, performed by Al Green
   Tonight you didn't come / And my senses all were reeling / I had a certain scary feeling you'd been untrue 2019, “The Night You Didn't Come”, in Becoming Peter Ivers, performed by Peter Ivers