Noun
Freedom from agitation or excitement of mind; coolness in trying circumstances; indifference; calmness.
Source: Webster's dictionarysang froid
Let what will be said or done, preserve your sang-froid immovably, and to every obstacle, oppose patience, perseverance, and soothing language. Thomas Jefferson
keep your cool Source: Internet
And it was her sang-froid and her absolute refusal to be shocked by this, which immediately silenced all the students. Source: Internet
Also pejorative in the phrase meurtre de sang-froid ("cold-blooded murder"). ; sans: without. Source: Internet
Diogenes Laertius, Lives, ix. 61 Anaxarchus is said to have praised Pyrrho's "indifference and sang-froid." Source: Internet