The phrase "free-and-easy" typically describes a person who is relaxed, easygoing, and carefree. Antonyms for this phrase might include words like anxious, uptight, stressed, tense, or nervous. Rather than being at ease, someone who is anxious might feel worried or nervous about upcoming events, while someone who is uptight may be overly concerned with following rules or conventions. A stressed-out person might be overwhelmed by the pressures of daily life, while someone who is tense might feel physically tight and on edge. All of these antonyms suggest a lack of the casual, carefree attitude typically associated with being "free-and-easy.