What are the opposite words for most right-angled?

The opposite of "most right-angled" would be "least right-angled". A right angle is a 90-degree angle, so an angle that is "least right-angled" would be closer to 180 degrees, also known as a straight angle. Other antonyms that could be used include obtuse, curved, or angled. These describe angles that are greater than 90 degrees and are more varied in shape. In contrast, acute angles measure less than 90 degrees, while reflex angles measure greater than 180 degrees. By using different antonyms, we can describe various types of angles and their measurements.