The word "trigonous" refers to something having three corners or sides, so synonyms for "most trigonous" would be describing something as having the most triangular shape or form. Other words that could be used to describe something that is "most trigonous" include triangular, three-sided, pyramidal, or conical. These words can evoke a sense of stability or balance in architecture or design, while also emphasizing the sharp, pointed facets that define the structure. The term 'triangular' can also be used to describe the geometrical shape in art, mathematics, or science, indicating the significance and ubiquity of three-sided shapes.