cool, calm, and collected
Calm and composed, self-possessed. For example, No matter what the board decides, you have to appear cool, calm, and collected in front of the stockholders. This alliterative synonym for cool as a cucumber dates from the late 1800s.
Words nearby cool, calm, and collected
cool jazz,
cool off,
cool one's heels,
cool out,
cool school,
cool, calm, and collected,
cool-headed,
coolabah,
coolamon,
coolant,
cooldown