What is the meaning of untrue?

adjective

• Not according with the facts.
  • usage: "unfortunately the statement was simply untrue"
• Not true to an obligation or trust. "is untrue to his highest opportunity and duty-Bruno Laske
• Not accurately fitted; not level.
  • usage: "the frame was out of true"; "off-level floors and untrue doors and windows"
  • synonyms: out of true
• Used especially of persons. ( not dependable in devotion or affection; unfaithful)
  • usage: "a false friend"; "when lovers prove untrue"
  • synonyms: false