Definition of untrue adjective from the Oxford Advanced Learner's Dictionary



    BrE BrE//ʌnˈtruː//
    ; NAmE NAmE//ʌnˈtruː//
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  1. 1not true; not based on facts These accusations are totally untrue. an untrue claim It is untrue to say that something like this could never happen again.
  2. 2untrue (to somebody/something) (formal) not loyal to somebody/something synonym unfaithful If he agreed to their demands, he would have to be untrue to his own principles. opposite true
  3. Word OriginOld English untrēowe ‘unfaithful’ (see un-, true).Word Familytrue adjective (untrue)truth nountruthful adjective (untruthful)truthfully adverbtruly adverb
See the Oxford Advanced American Dictionary entry: untrue