The term 'calm, cool, and collected' is often used to describe someone who is composed and in control of their emotions. This can be seen in the two crossword solutions for this term: SERENE (6 letters) and SEDATE (6 letters). SERENE is defined as being peaceful and untroubled, while SEDATE is defined as being dignified and restrained. Both words are synonyms for the phrase 'calm, cool, and collected' and can be used to describe someone who is composed and in control of their emotions.