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Adjective: atypical  ey'ti-pi-kul
  1. Not representative of a group, class, or type
    "a class of atypical mosses"; "atypical behaviour is not the accepted type of response that we expect from children"; "a group that is atypical of the target audience";
    - untypical
  2. Deviating from normal expectations; somewhat odd, strange, or abnormal
    "these days large families are atypical"; "atypical clinical findings";
    - irregular

See also: abnormal, typicality, uncharacteristic, unnatural, unrepresentative

Antonym: typical