'Secretly' in the Bible

If thy brother, the son of thy mother, or thy son, or thy daughter, or the wife of thy bosom, or thy friend, who is to thee as thy soul, entice thee secretly, saying, Let us go and serve other gods (whom thou hast not known, thou, nor thy fathers;

Cursed be the man that maketh a graven or molten image, an abomination to Jehovah, a work of the craftsman's hand, and putteth it up secretly! And all the people shall answer and say, Amen.

Cursed be he that smiteth his neighbour secretly! And all the people shall say, Amen.

because of her afterbirth which hath come out between her feet, and her children whom she shall bear; for she shall secretly eat them for want of everything in the siege and in the straitness wherewith thine enemy shall distress thee in thy gates.