一一 is short for 一個接一個 (one after another/ one by one)
一一介紹 = introducing items one by one
一一解釋 = explaining one thing after another
一一詳述 = item by item describing in details
不一一介紹 = not introduce items one by one
不一一解釋 = not explaining one thing after another = not explaining everything
不一一詳述 = not item by item describing in details
You cannot just say 不一一 (not one by one) and not adding a verb after it.
The dictionary's definition of 一一 should be "one by one (adv)"
不一一 shouldn't even be listed. It is like listing "wonder" and then add another entry for "not wonder"