The word "most quadrate" refers to something that is most square or rectangular in shape. Antonyms for this word would include "curved," "irregular," "round," "oval," "circular," "crooked," "angled," and "oblique." When describing shapes or objects, choosing an antonym for "most quadrate" can help to communicate a specific meaning or feeling. A curved shape, for example, might suggest fluidity, grace, and movement, while an irregular shape could convey unpredictability or a lack of symmetry. Using antonyms effectively can help to add nuance and interest to your writing, making your descriptions more vivid and engaging to readers.