'Idea' in the Bible

And the Lord said to Cain, Where is your brother Abel? And he said, I have no idea: am I my brother's keeper?

But Abimelech said, I have no idea who has done this thing; you never gave me word of it, and I had no knowledge of it till this day.

And turning to her by the roadside, he said to her, Let me come in to you; for he had no idea that she was his daughter-in-law. And she said, What will you give me as my price?

Now though Joseph saw that these were his brothers, they had no idea who he was.

And they said, The man put a number of questions to us about ourselves and our family, saying, Is your father still living? have you another brother? And we had to give him answers; how were we to have any idea that he would say, Come back with your brother?

As well as more money, with which to get food: we have no idea who put our money in our bags.