əksˌtɛmpɚˈeɪni.əs ɛksˌtɛm.pɜː(ɹ)ˈeɪn.i.əs ɛkˈstɛmpəɹi əkˈstɛmpəɹaɪz ɪmˈpɹɒmptju ɪmˈpɹɑmpt(j)u ˈɪmpɹəvaɪz ˌɔfˈhænd ɒfˈhændɪd ɔfˈhændɪd ɑfˈhændɪd spɒnˈteɪ.ni.əs spɑnˈteɪ.ni.əs perform without preparation he extemporized a speech at the wedding with little or no preparation or forethought his ad-lib comments showed poor judgment an extemporaneous piano recital an extemporary lecture an extempore skit an impromptu speech offhand excuses trying to sound offhanded and reassuring an off-the-cuff toast a few unrehearsed comments said or done without having been planned or written in advance he made a few ad-lib remarks remark made spontaneously without prior preparation his ad-libs got him in trouble with the politicians