よくは知らない
I know nothing
知らないわ。
I do not know for certain.
〜を知らない
あまり知らないさま
to be {ill-informed} about something
I don't know either
知られない
I don't know anything about it whatsoever.
知らないとさ
I do not know the particulars.
There are many people who do not know.