ineffective vs idle

ineffective is not a noun while idle is a noun.

Word	Noun	Adjective	Verb	Adverb
ineffective	No	Yes	No	No
idle	Yes	Yes	Yes	No

ineffective (noun)	idle (noun)
	the state of an engine or other mechanism that is idling

ineffective (adjective)	idle (adjective)
not producing an intended effect	not in action or at work
lacking in power or forcefulness	silly or trivial
lacking the ability or skill to perform effectively; inadequate	not in active use
	lacking a sense of restraint or responsibility
	not having a job
	not yielding a return
	without a basis in reason or fact

ineffective (verb)	idle (verb)
	run disconnected or idle
	be idle; exist in a changeless situation