atypical

Adjective
  1. Not representative of a group, class, or type (synset 302479427)
    "a class of atypical mosses"; "atypical behavior is not the accepted type of response that we expect from children"
    also:
    tells us about: typicality - the state of being that is typical
    similar to: unrepresentative - not exemplifying a class
    same as: atypic, untypical
  2. Deviating from normal expectations;
    Somewhat odd, strange, or abnormal (synset 301601391)
    "these days large families are atypical"; "atypical clinical findings"; "atypical pneumonia"; "highly irregular behavior"
    similar to: abnormal, unnatural - not normal; not typical or usual or regular or conforming to a norm
    same as: irregular

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