jeux de mots (noun) play on words: humorous ambiguous use of word or phrase
Sinonime: collected, commonsensical,
composed, cool as cucumber,
cool*,
enduring,
impassive, imperturbable,
patient,
resigned, stoical,
tranquil, unagitated, unflappable, unmoved, unruffled
Antonime: excited,
imprudent,
rash