The term 'most free-spirited' implies a person who is uninhibited, spontaneous, and independent. Antonyms for this word can describe an individual who is more controlled, cautious, or guarded. These antonyms include "conservative," "conventional," "traditional," "by the book," "constrained," "restricted," and "inhibited." These terms suggest that people who follow the rules, stick to convention, and avoid risks may be less free-spirited than those who reject boundaries and seek adventure. While there is no right or wrong way to live life, these antonyms can help individuals navigate different attitudes towards freedom and personal expression.