lying /ˈlaɪ.ɪŋ/adjective 1noun 2forms 5phrases 1 adjective1 •Tending to tell lies, untruthful, mendaciousGloster: Then, Saunder, sit there, the lyingest knave in Christendom. — 1591 noun2 •An act or telling a lie or falsehood; the practice of telling lies.Trump’s lying is no less constant or blatant than in 2016, but by now it feels familiar, already priced in. What more is there to say about the “war on truth” a decade into Trump’s political career? — 2025 •The act of one who lies, or keeps low to the ground.But whom could the lyings in wait of the human heart escape? — 1854 formslyings · lyinger · more lying · lyingest · most lying Phrases with lying low-lyingLower than nearby areas.