extemporaneous vs off-the-cuff

extemporaneous and off-the-cuff both are adjectives.

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

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

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

Other synonyms of extemporaneous include ad-lib, extemporary, extempore, impromptu, offhand, offhanded, unrehearsed.

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