Not representative of a group, class, or type:
— A class of atypical mosses.
— Atypical behavior is not the accepted type of response that we expect from children.

synonyms: atypic, untypical.

Polish: nietypowy

Deviating from normal expectations; somewhat odd, strange, or abnormal:
— These days large families are atypical.
— Atypical clinical findings.
— Atypical pneumonia.

synonym: irregular.

Polish: nienaturalny