Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.

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On the other hand Walling was to all appearance the coolest man in the room.

A week ago I should have said that was the coolest head of the lot.

If Glen is a captive use your coolest judgment about interfering.

Knight was at once the most ardent and the coolest man alive.

"He is the best sportsman who has the coolest head," replied I, sleepily.

"He's the coolest hand I ever heard," Farquhar said to the party on the porch.

The coolest month is December, when the glass stays at about 77°; and in May, the hottest month, at 86°.

Then Rose in the coolest, lightest voice introduced him to Agnes.

It was given, this announcement, with the coolest matter-of-fact assurance.

Now collect your faculties and act on your coolest judgment.

WORD ORIGIN

Old English col "not warm" (but usually not as severe as cold), also, of persons, "unperturbed, undemonstrative," from Proto-Germanic *koluz (cf. Middle Dutch coel, Dutch koel, Old High German kuoli, German kühl "cool," Old Norse kala "be cold"), from PIE root *gel- "cold, to freeze" (see cold (adj.)).

Applied since 1728 to large sums of money to give emphasis to amount. Meaning "calmly audacious" is from 1825. Slang use for "fashionable" is 1933, originally Black English; modern use as a general term of approval is from late 1940s, probably from bop talk and originally in reference to a style of jazz; said to have been popularized in jazz circles by tenor saxophonist Lester Young. Related: Coolly.