old hat Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition adjective. something that is outdated or no longer interesting. Example Sentence I suppose my favorite joke's a bit old hat by now. More Example Sentences His jokes were old hat and not funny. Synonyms outdated; stale; boring Antonyms new; fresh; innovative Hear It! Say It! Write It! old hat Switch to cursive Start Share with your friends: