From Longman Dictionary of Contemporary Englishunscriptedun‧script‧ed /ˌʌnˈskrɪptɪd◂/ adjective PLAN#an unscripted broadcast, speech etc is not written or planned before it is made
Examples from the Corpus
unscripted• Encounters between police and public are largely informal and unscripted.• The former Conservative prime minister's unscripted addition upset Mr Hague's aides.• And unscripted exchanges are not his best format.• Now he really was human - unscripted, jokey, even a bit passionate.• He made parliament come alive with unscripted reports of the heated debates during the Suez debacle.• The high point of his campaign came in three lengthy and unscripted television interviews with a sympathetic journalist. 