Word familyadjectiveextemporalextemporaneousextemporarynounextemporaneityextemporaneousnessextemporarinessextemporizationadverbextemporaneouslyextemporarilyextemporeverbextemporize
ex·tem·po·rize (also extemporise British English) /ɪkˈstempəraɪz/ verb [intransitiveI] formal