unrehearsed vs extemporary

unrehearsed and extemporary both are adjectives.

Word	Noun	Adjective	Verb	Adverb
unrehearsed	No	Yes	No	No
extemporary	No	Yes	No	No

As adjectives, unrehearsed and extemporary are synonyms defined as:

unrehearsed and extemporary: with little or no preparation or forethought

Other synonyms of unrehearsed include ad-lib, extemporaneous, extempore, impromptu, off-the-cuff, offhand, offhanded.

unrehearsed (adjective)	extemporary (adjective)
with little or no preparation or forethought	with little or no preparation or forethought