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

1.
atipico, insolito
not representative of a type, group, or class; unusual.
:
•
His response was atypical of his usual calm demeanor.
La sua risposta era atipica del suo solito comportamento calmo.
•
The patient presented with atypical symptoms.
Il paziente ha presentato sintomi atipici.