The antonyms for the word "more constricted" would be "less restricted," "more open," "more spacious," "more expanded," and "more relaxed." These antonyms suggest a sense of freedom, space, and ease of movement. Something that is less restricted or more expanded allows for more opportunities and possibilities. When we feel more relaxed, we are able to breathe easier and move with less tension in our bodies. Using antonyms like these can help us to expand our vocabulary and find new ways to describe the world around us.