Definition of "Untrue" :
adjective: (used especially of persons) not dependable in devotion or affection; unfaithful
"When lovers prove untrue."
adjective: not accurately fitted; not level
"Off-level floors and untrue doors and windows."
adjective: not true to an obligation or trust
"Is untrue to his highest opportunity and duty."
adjective: not according with the facts
"Unfortunately the statement was simply untrue."