extempore vs offhanded

extempore and offhanded both are adjectives.

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

As adjectives, extempore and offhanded are synonyms defined as:

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

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

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