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Adjective: uncharacteristic  ,ún,ker-ik-tu'ris-tik [N. Amer], ,ún,ka-rik-tu'ris-tik [Brit]
  1. Not typical or characteristic; distinctly different from the usual
    "a book uncharacteristic of its author"

See also: atypic [rare], atypical, untypical

Antonym: characteristic