abrupt vs discourteous

abrupt and discourteous both are adjectives.

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

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