atypical (Adjective) — Not representative of a group, class, or type. ex. "a class of atypical mosses" ex. "atypical behaviour is not the accepted type of response that we expect from children" ex. "a group that is atypical of the target audience"
atypical (Adjective) — Deviating from normal expectations; somewhat odd, strange, or abnormal. ex. "these days large families are atypical" ex. "atypical clinical findings"