ATYPICAL
atypical, irregular
(adjective) deviating from normal expectations; somewhat odd, strange, or abnormal; “these days large families are atypical”; “atypical clinical findings”; “atypical pneumonia”; “highly irregular behavior”
atypical, untypical, atypic
(adjective) 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”
Source: WordNet® 3.1
Etymology
Adjective
atypical (comparative more atypical, superlative most atypical)
Not conforming to the normal type.
Unusual or irregular.
Antonyms
• typical
Noun
atypical (plural atypicals)
(pharmacy) An atypical antipsychotic.
Source: Wiktionary
A*typ"ic, A*typ"ic*al, a. Etym: [Pref. a- not + typic, typical.]
Definition: That has no type; devoid of typical character; irregular;
unlike the type.
Source: Webster’s Unabridged Dictionary 1913 Edition