extemporaneous
Pronunciation:
/əksˌtɛmpɚˈeɪni.əs//ɛksˌtɛm.pɜː(ɹ)ˈeɪn.i.əs/adjective
Definitions
Without preparation or advanced thought; offhand.
Example: "The lovely words of a prepared speech however cannot erase extemporaneous words and deeds — thousands of them — that have run contrary to those aspirations.”