senseless vs stupid

senseless is not a noun while stupid is a noun.

Word	Noun	Adjective	Verb	Adverb
senseless	No	Yes	No	No
stupid	Yes	Yes	No	No

senseless (noun)	stupid (noun)
	a person who is not very bright

senseless (adjective)	stupid (adjective)
(of especially persons) lacking sense or understanding or judgment	lacking or marked by lack of intellectual acuity
unresponsive to stimulation	lacking intelligence
not marked by the use of reason	in a state of mental numbness especially as resulting from shock
serving no useful purpose; having no excuse for being