discourteous vs abrupt

discourteous and abrupt both are adjectives.

Word	Noun	Adjective	Verb	Adverb
discourteous	No	Yes	No	No
abrupt	No	Yes	No	No

discourteous (adjective)	abrupt (adjective)
showing no courtesy; rude	surprisingly and unceremoniously brusque in manner
lacking social graces	marked by sudden changes in subject and sharp transitions
	dangerously steep
	exceedingly sudden and unexpected