When a man takes a wife and marries her, if then she finds no favor in his eyes because he has found some indecency in her, and he writes her a certificate of #divorce and puts it in her hand and sends her out of his house, and she departs out of his house...
#deuteronomy 24:1 #marriage

"Some uncleanness" isn't just something that the man dislikes. It's also not the same Hebrew word normally translated "unclean". Rather, it implies something sexual or indecent, yet still short of provable adultery.