illicitly
US /ɪˈlɪs.ɪt.li/
UK /ɪˈlɪs.ɪt.li/

1.
in a manner disapproved of or not allowed by custom or law
:
•
He was accused of illicitly importing goods.
•
They were meeting illicitly in secret locations.
in a manner disapproved of or not allowed by custom or law