cubical Get Printable Handwriting (cu-bi-cal) 3 syllables Learn It! Spelling Test Definition adjective. 1 in the form of a cube; cubic; 2.of or concerning spatial volume. Example Sentence He works in a cubical office. Synonyms cubelike; cube-shaped; cubiform; cuboid; cuboidal; cubic Antonyms linear; one-dimensional Share with your friends: