Another word for imperturbable

MLA Style
"imperturbable." YourDictionary, n.d. Web. 18 January 2019. <https://thesaurus.yourdictionary.com/imperturbable>.
APA Style
imperturbable. (n.d.). Retrieved January 18th, 2019, from https://thesaurus.yourdictionary.com/imperturbable
Another word for imperturbable

Not easily excited, even under pressure:
calm, collected, composed, cool, cool-headed, detached, even1, even-tempered, nonchalant, possessed, unflappable, unruffled. See calm
MLA Style
"imperturbable." YourDictionary, n.d. Web. 18 January 2019. <https://thesaurus.yourdictionary.com/imperturbable>.
APA Style
imperturbable. (n.d.). Retrieved January 18th, 2019, from https://thesaurus.yourdictionary.com/imperturbable