mischievious Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition adjective. 1 tending to behave in an annoying or mildly harmful way 2 teasing or sly Example Sentence The mischievious gossip ruined her good name. Synonyms bad; naughty; sly Antonyms good; well-behaved Hear It! Say It! Write It! mischievious Switch to cursive Start Share with your friends: