Unflustered is a term used to describe someone who is composed and in control of their emotions. It can be broken down into three words: CALM, COOL, and SERENE. CALM is defined as having a quiet and peaceful demeanor, while COOL is defined as having a relaxed and collected attitude. SERENE is defined as having a tranquil and untroubled state of mind. Together, these three words form the term UNFLUSTERED, which describes someone who is composed and in control of their emotions.