Definition of unrepresentative adjective from the Oxford Advanced American Dictionary

unrepresentative

adjective
/ˌʌnrɛprɪˈzɛntəɪv/
 
unrepresentative (of someone/something)
 
not typical of a group of people or things and therefore not useful as a source of information about that group
synonym untypicalan unrepresentative sampleThis early novel is unrepresentative of her work as a whole. antonym representative