thwartwise Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition adjective. positioned or turned in a diagonal or crosswise direction Example Sentence The car was parked thwartwise across two parking spaces. Synonyms diagonal; crosswise; slanting Antonyms straight; parallel Hear It! Say It! Write It! thwartwise Switch to cursive Start Share with your friends: