stunned vs stupid

stunned is not a noun while stupid is a noun.

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

As adjectives, stunned and stupid are synonyms defined as:

stunned and stupid: in a state of mental numbness especially as resulting from shock

Other synonyms of stunned include dazed, stupefied.

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

stunned (adjective)	stupid (adjective)
in a state of mental numbness especially as resulting from shock	lacking or marked by lack of intellectual acuity
filled with the emotional impact of overwhelming surprise or shock	lacking intelligence
knocked unconscious by a heavy blow	in a state of mental numbness especially as resulting from shock