demented vs disturbed

demented and disturbed both are adjectives.

Word	Noun	Adjective	Verb	Adverb
demented	No	Yes	No	No
disturbed	No	Yes	No	No

As adjectives, demented and disturbed are synonyms defined as:

Other synonyms of demented include brainsick, crazy, mad, sick, unbalanced, unhinged.

demented (adjective)	disturbed (adjective)
affected with madness or insanity	having the place or position changed
	affected with madness or insanity
	emotionally unstable and having difficulty coping with personal relationships
	afflicted with or marked by anxious uneasiness or trouble or grief