not showing all the characteristics that you would usually expect from a particular group of things or people, or from a particular person

Her angry outburst was untypical; she's usually a very quiet woman. 她一般不会这样发脾气，平时她是一个很安静的人。

It is not untypical of girls of her age to be concerned about their appearance. 她那般年纪的女孩子一般都很在意外表。

Compare: atypical non-typical