two-faced . two-faced {adj.} Insincere; disloyal; deceitful. Don't confide too much in him as he has the reputation of being two-faced. Compare: SPEAK WITH A FORKED TONGUE. Categories: add yours tongue {adj.} Source: A Dictionary of American Idioms by A. Makkai, M.T. Boatner, J.E. Gates © 2024 To section: T Subscribe to: American IdiomsIdioms feedEnglish languageHome page and general feed Discuss