Embarrassing, Insulting, Or Deceiving Someone

Rabbi Yochanan said in the name of Rabbi Shimon bar Yochai: Ona'as devarim (verbal wrongdoing) is a greater sin than monetary wrongdoing, for concerning the former the Torah states, "And you should fear your G-d," whereas, concerning the latter it is not stated "And you shall fear your G-d."

(Talmud - Bava Metzia 58b)