The term 'cool and collected' is often used to describe someone who is composed and in control of their emotions. This can be seen in the crossword solutions for the term, which include 'SERENE' (6 letters), 'CALM' (4 letters), 'unshaken' (8 letters), 'SEDATE' (6 letters), and 'SANE' (4 letters). All of these words imply a sense of composure and stability, suggesting that the person is not easily rattled or affected by external events.