Antonyms for the phrase "makes fuss" could include words such as "calm," "relaxed," "stoic," or "composed." If someone is not making a fuss, they may be described as being "easy-going," "laid-back," or "unflappable." Other related terms could include "undisturbed," "restrained," or "unperturbed." Additionally, individuals who are not prone to making a fuss may be considered "unbothered" or "unruffled" by a particular situation. While making a fuss can sometimes lead to positive outcomes, such as gaining attention or resolving an issue, sometimes it is important to remain calm and level-headed in order to handle a situation with grace and tact.