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Mr. Cool

noun, Informal.
1.
a person who is ideally or excessively self-possessed, poised, or reserved (sometimes used with Miss, Ms., or Mrs. instead of Mr. when referring to a female).
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for Mr. Cool
Contemporary Examples
Contemporary definitions for Mr. Cool
noun

a pleasant person who seeks to be likable and avoid trouble

Examples

If you go after his girlfriend, he will not be Mr. Nice Guy any longer.

Usage Note

can be used with any term of address, as Ms.

Dictionary.com's 21st Century Lexicon
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