sermonises Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition verb. to preach a sermon or sermons or to speak as if doing so. Chiefly British. Example Sentence This man always sermonises his beliefs. Synonyms preach; lecture; teach Antonyms listen Hear It! Say It! Write It! sermonises Switch to cursive Start Share with your friends: