1. not representative of a group, class, or type (Freq. 1) - 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 • Syn: untypical • Ant: typical • Similar to: unrepresentative • See Also: abnormal, unnatural, uncharacteristic • Derivationally related forms: untypicality (for: untypical), atypicality • Attrubites: typicality 2. deviating from normal expectations; somewhat odd, strange, or abnormal - these days large families are atypical - atypical clinical findings - atypical pneumonia - highly irregular behavior • Syn: irregular • Similar to: abnormal, unnatural • Derivationally related forms: irregularity (for: irregular), atypicality