atypical
1. [ adjective ] deviating from or not conforming to type
Synonyms: untypical
Examples:

"atypical behavior..not the accepted type of response that we expect from children"- G.E.Gardner

Related terms: typical unrepresentative abnormal uncharacteristic typicality
2. [ adjective ] deviating from what is usual or common or to be expected; often somewhat odd or strange
Synonyms: irregular
Examples:

"these days large families are atypical" "highly irregular behavior"

Related terms: abnormal
3. [ adjective ] not conforming to type
Examples:

"showed atypical agility"

Related terms: uncharacteristic
Similar spelling:   atypically
  atypicality