unknowledgeable

US /ˌʌnˈnɑː.lɪ.dʒə.bəl/
UK /ˌʌnˈnɑː.lɪ.dʒə.bəl/
1.

incognoscível

not knowing a lot:

:
•
The sales clerk was frustratingly unknowledgeable about the product range.