• WordNet 3.6
    • adj coolheaded marked by calm self-control (especially in trying circumstances); unemotional "play it cool","keep cool","stayed coolheaded in the crisis","the most nerveless winner in the history of the tournament"
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Webster's Revised Unabridged Dictionary
    • a coolheaded Having a temper not easily excited; free from passion; unshakably calm and collected.
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In literature:

I simply can't and won't dismiss him, as that infernally efficient and coolheaded Scot demands.
"To Him That Hath" by Ralph Connor
The upshot of the matter was that the coolheaded Jones got rid of the wretched little lot for $490 cash.
"The Continental Monthly, Vol. 4, No. 1, July, 1863" by Various
Funny, though, he appeared the very essence of a coolheaded banker.
"The Samurai Strategy" by Thomas Hoover

In news:

Whittier College's president calls for a more coolheaded discussion on revisiting drinking-age laws.
American Public Opinion Is Remarkably Coolheaded on North Korea.