extemporaneous

From Late Latin extemporāneus, from Latin ex tempore (“impromptu”).

• (Canada) IPA^(key): /əksˌtɛmpɚˈeɪni.əs/
• (UK) IPA^(key): /ɛksˌtɛm.pɜː(ɹ)ˈeɪn.i.əs/
• Rhymes: -eɪniəs

extemporaneous (comparative more extemporaneous, superlative most extemporaneous)

1. without preparation or advanced thought; offhand

   • "The lovely words of a prepared speech however cannot erase extemporaneous words and deeds — thousands of them — that have run contrary to those aspirations.”

• (without preparation): off-the-cuff, extemporal (archaic), improvised; see also Thesaurus:impromptu

• extemporanea
• extemporaneousness
• extemporize