Most rectilinear means most straight or most direct. Its antonyms would be words that describe curves, angles, or indirect paths. Some antonyms for most rectilinear include: curved, bent, twisted, serpentine, meandering, winding, sinuous, crooked, irregular, contorted, circuitous, indirect, adroit, and oblique. While most rectilinear is often used to describe something that is uncomplicated and straightforward, its antonyms are often used to describe things that are more complex, intricate, or elaborate. By using these antonyms in contrast to most rectilinear, we can create a more nuanced description of objects, spaces, or ideas.