intelligence vs unintelligent

intelligence is a noun but unintelligent is not a noun.

Word	Noun	Adjective	Verb	Adverb
intelligence	Yes	No	No	No
unintelligent	No	Yes	No	No

intelligence (noun)	unintelligent (noun)
the operation of gathering information about an enemy
the ability to comprehend; to understand and profit from experience
information about recent and important events
secret information about an enemy (or potential enemy)
a unit responsible for gathering and interpreting information about an enemy

intelligence (adjective)	unintelligent (adjective)
	lacking intelligence