atypical

atypical
    adj 1: 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" [syn:
           {atypical}, {untypical}] [ant: {typical}]
    2: deviating from normal expectations; somewhat odd, strange, or
       abnormal; "these days large families are atypical"; "atypical
       clinical findings"; "atypical pneumonia"; "highly irregular
       behavior" [syn: {atypical}, {irregular}]
    

Atypic \A*typ"ic\, Atypical \A*typ"ic*al\, a. [Pref. a- not +
   typic, typical.]
   That has no type; devoid of typical character; irregular;
   unlike the type.
   [1913 Webster]