atypical
US /ˌeɪˈtɪp.ɪ.kəl/
UK /ˌeɪˈtɪp.ɪ.kəl/

1.
atypique, inhabituel
not representative of a type, group, or class; unusual.
:
•
His response was atypical of his usual calm demeanor.
Sa réponse était atypique de son comportement calme habituel.
•
The patient presented with atypical symptoms.
Le patient a présenté des symptômes atypiques.