diabolic Get Printable Handwriting (di-a-bol-ic) 4 syllables Hear It! Say It! Write It! Learn It! Spelling Test Definition adjective. devilish; wicked or evil. Example Sentence The diabolic expression on his face scared her. Synonyms devilish; cruel; demoniac; evil; fiendish Antonyms loving; friendly; helpful Hear It! Say It! Write It! diabolic Switch to cursive Start Share with your friends: