Unknowledgeable and Under-the-table

Unknowledgeable adjective - Unaware because of a lack of relevant information or knowledge.

Under-the-table and unknowledgeable are semantically related. In some cases you can use "Under-the-table" instead an adjective "Unknowledgeable".

Under-the-table adjective - Designed and carried out secretly or confidentially.

Unknowledgeable and under-the-table are semantically related. Sometimes you can use "Unknowledgeable" instead an adjective phrase "Under-the-table".