Adjective
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deviating from normal expectations
somewhat odd, strange, or abnormal
"these days large families are atypical"
"atypical clinical findings"
"atypical pneumonia"
"highly irregular behavior"
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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"