The term "most domical" indicates that something is highly arched or curved. When looking for antonyms for this expression, we can consider words that connote the opposite meaning. For example, "flat," "level," "horizontal," and "straight" can all be antonyms for "most domical." If we are talking about a landscape, "hills," "mountains," and "peaks" can also provide an antonymic sense to "most domical." Conversely, if we are discussing architecture, "angular," "boxy," "rectilinear," and "sharp-edged" all work as antonyms. The word "linear," which refers to something that has straight lines, could also be a suitable antonym for "most domical.