Extemporized is a verb that means to speak or perform without planning or preparation. There are several synonyms for this word, including improvise, ad lib, extemporize, wing it, and impromptu. Improvise means to create or perform spontaneously. Ad lib means to speak or act without preparation. Extemporize means to speak or perform without prior preparation. Wing it means to perform without planning or preparation. Impromptu means something done or said without prior preparation. All these words have the same meaning as extemporized, and can be used interchangeably to express the idea of speaking or performing without preparation or planning.