offhanded vs extempore

offhanded and extempore both are adjectives.

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

As adjectives, offhanded and extempore are synonyms defined as:

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

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

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