Fancyfree is an adjective that describes someone who is carefree, spontaneous, and unconstrained. Antonyms of this word include serious, uptight, tense, anxious, and worried. A person who is not fancyfree is someone who is overly concerned with details and responsibilities, someone who is constantly worrying about the future and unable to enjoy the present moment. They may be preoccupied with their daily duties and routines, and may find it difficult to let go and have fun. However, it is important to strike a balance between being responsible and being carefree, as both aspects are necessary for a fulfilling life.