Source : Webster's Revised Unabridged Dictionary (1913)

Untrue \Un*true"\, a.
   1. Not true; false; contrary to the fact; as, the story is
      untrue.

   2. Not faithful; inconstant; false; disloyal. --Chaucer.

Untrue \Un*true\, adv.
   Untruly. [Obs. or Poetic] --Chaucer.

Source : WordNet®

untrue
     adj 1: not according with the facts; "unfortunately the statement
            was simply untrue"; "the facts as reported were wrong"
            [syn: {wrong}]
     2: not true to an obligation or trust; "is untrue to his
        highest opportunity and duty"-Bruno Laske
     3: not accurately fitted; not level; "the frame was out of
        true"; "off-level floors and untrue doors and windows"
        [syn: {out of true}]
     4: (used especially of persons) not dependable in devotion or
        affection; unfaithful; "a false friend"; "when lovers
        prove untrue" [syn: {false}]