The phrase "cool mind" can be used in written English, although it is an informal phrase not suitable for all contexts.
Example: It requires a cool mind to keep calm in a difficult situation.
That would make your parents quite cool, mind.
This cool mind also enables him to meet adversity with positivity.
A cool mind, please, JJ, it's an important job you do.
Dreadfully late in the day – as is so often the case with Mr Cameron and his "government by essay crisis" – everything became clear to his cool mind.
He worked with the designers of America's early space-craft, providing a cool mind when everything seemed to be going wrong.
Robert Smirke had travelled extensively in Greece and Sicily to sketch the ruins of ancient temples before he turned his cool mind and his elegant hand to the design of what is today, in terms of visitor numbers, Britain's most popular tourist attraction.
"I hope cool minds reflect on what my orders have been," he said.
When a judge starts berating the courtroom to remember that he is not a Nazi, cool minds are not reflecting, on any side.
Be active and cool minded.
Explain them with cool minds.
Woodbridge, the firebrand, found his match in Woodforde, the cooler mind.
