off-the-cuff vs extemporaneous

off-the-cuff and extemporaneous both are adjectives.

Word	Noun	Adjective	Verb	Adverb
off-the-cuff	No	Yes	No	No
extemporaneous	No	Yes	No	No

As adjectives, off-the-cuff and extemporaneous are synonyms defined as:

off-the-cuff and extemporaneous: with little or no preparation or forethought

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

off-the-cuff (adjective)	extemporaneous (adjective)
with little or no preparation or forethought	with little or no preparation or forethought