| adjective | not representative of a group, class, or type “a group that is atypical of the target audience” |
| adjective | deviating from normal expectations; somewhat odd, strange, or abnormal “these days large families are atypical” |
| atypicality | noun | any state that is not typical |
| untypicality | noun | any state that is not typical |
| irregularity | noun | behavior that breaches the rule or etiquette or custom or morality |