'Improper' in the Bible

For the Lord your God walks throughout your camp to protect you and deliver your enemies to you; so your encampments must be holy. He must not see anything improper among you or He will turn away from you.

“If a man marries a woman, but she becomes displeasing to him because he finds something improper about her, he may write her a divorce certificate, hand it to her, and send her away from his house.