unready vs ready

unready is not a noun while ready is a noun.

Word	Noun	Adjective	Verb	Adverb
unready	No	Yes	No	No
ready	Yes	Yes	Yes	No

unready (noun)	ready (noun)
	poised for action

unready (adjective)	ready (adjective)
not prepared or in a state of readiness; slow to understand or respond	completely prepared or in condition for immediate action or use or progress
	apprehending and responding with speed and sensitivity
	made suitable and available for immediate use
	mentally disposed
	(of especially money) immediately available

unready (verb)	ready (verb)
	make ready or suitable or equip in advance for a particular purpose or for some use, event, etc
	prepare for eating by applying heat