More straightlaced is a term used to describe someone who is conservative, uptight, or overly formal. Antonyms for more straightlaced can be used to describe someone who is more relaxed, casual, or laid-back. These antonyms can include terms like easygoing, liberal, open-minded, or nonconformist. A person who is less straightlaced is typically more flexible in their thoughts and beliefs, and is more open to new experiences and ideas. Using antonyms for more straightlaced can help to convey a more positive, relaxed, and open-minded tone when describing someone's personality or behavior.