Atypical
[eɪ'tɪpɪk(ə)l;æ-] or ['e'tɪpɪkl]
Definition
(adj.) deviating from normal expectations; somewhat odd, strange, or abnormal; 'these days large families are atypical'; 'atypical clinical findings'; 'atypical pneumonia'; 'highly irregular behavior' .
(adj.) not representative of a group, class, or type; 'a group that is atypical of the target audience'; 'a class of atypical mosses'; 'atypical behavior is not the accepted type of response that we expect from children' .
Edited by Fred--From WordNet
Definition
(a.) That has no type; devoid of typical character; irregular; unlike the type.
Checker: Rhonda