Noun
cool head (plural cool heads)
(idiomatic) A calm, focused demeanor and mindset; a person having such characteristics.
Keep a cool head and maintain a low profile. Never take the lead - but aim to do something big. Deng Xiaoping
Keep a cool head and a warm heart. Mike Love
Most of an award-show host's job is showing up and keeping a cool head and soldiering through it, whether it's the Oscars or the Hallmark Channel's 'Hero Dog Awards.' Rob Sheffield
The first quality for a commander-in-chief is a cool head to receive a correct impression of things. He should not allow himself to be confused by either good or bad news. Napoleon Bonaparte
Have a cool head. Source: Internet
Masters pressed and pressured Holder all the way, but Holder’s resolve was strong and his cool head under pressure won the day. Source: Internet