unfriendly vs cool

unfriendly is not a noun while cool is a noun.

Word	Noun	Adjective	Verb	Adverb
unfriendly	No	Yes	No	No
cool	Yes	Yes	Yes	No

unfriendly (noun)	cool (noun)
	the quality of being at a refreshingly low temperature
	great coolness and composure under strain

unfriendly (adjective)	cool (adjective)
not disposed to friendship or friendliness	neither warm nor very cold; giving relief from heat
not easy to understand or use	psychologically cool and unenthusiastic; unfriendly or unresponsive or showing dislike
very unfavorable to life or growth	inducing the impression of coolness; used especially of greens and blues and violets when referring to color
not friendly	marked by calm self-control (especially in trying circumstances); unemotional
	fashionable and attractive at the time; often skilled or socially adept
	being satisfactory or in satisfactory condition
	used of a quantity or amount (especially of money) for emphasis