Definitions of atypical:
- adjective: deviating from what is usual or common or to be expected; often somewhat odd or strange
Example: "These days large families are atypical"
- adjective: deviating from or not conforming to type
Example: "Atypical behavior..not the accepted type of response that we expect from children- G.E.Gardner"
- adjective: not conforming to type
Example: "Showed atypical agility"
Search for atypical at other dictionaries: OneLook, Oxford, American Heritage, Merriam-Webster