offhand vs extempore

offhand and extempore both are adjectives.

Word	Noun	Adjective	Verb	Adverb
offhand	No	Yes	No	Yes
extempore	No	Yes	No	Yes

As adjectives, offhand and extempore are synonyms defined as:

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

offhand (adjective)	extempore (adjective)
casually thoughtless or inconsiderate	with little or no preparation or forethought
with little or no preparation or forethought

offhand (adverb)	extempore (adverb)
in a casually inconsiderate manner	without prior preparation
without previous thought or preparation