The quality of being calm and even-tempered; composure.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "equanimity" in a sentence
"We weren’t rolling in money, but we certainly had enough to live well, and I approached my thirties with a certain … no, I really don’t want to use the word equanimity here, even though it’s apt."
"When faced with a "Let it be" scenario, your sense of equanimity is the greatest victory."
"The only mainstream name I can think of with anything approaching equanimity is Broder."