unrepresentative vs atypical

unrepresentative and atypical both are adjectives.

Word	Noun	Adjective	Verb	Adverb
unrepresentative	No	Yes	No	No
atypical	No	Yes	No	No

unrepresentative (adjective)	atypical (adjective)
not exemplifying a class	not representative of a group, class, or type
	deviating from normal expectations; somewhat odd, strange, or abnormal