'Secret' in the Bible

By taking as her lover another man, and keeps it secret so that her husband has no knowledge of it, and there is no witness against her, and she is not taken in the act;

No evil power has effect against Jacob, no secret arts against Israel; at the right time it will be said of Jacob and of Israel, See what God has done!

Now when Balaam saw that it was the Lord's pleasure to give his blessing to Israel, he did not, as at other times, make use of secret arts, but turning his face to the waste land,

And looking on the Kenites he went on with his story and said, Strong is your living-place, and your secret place is safe in the rock.