im·per·turb·able adjective \ˌim-pər-ˈtər-bə-bəl\
Full Definition of IMPERTURBABLE
: marked by extreme calm, impassivity, and steadiness : serene
Examples of IMPERTURBABLE
- Although he seems outwardly imperturbable, he can get very angry at times.
- <the chef was absolutely imperturbable—even when the kitchen caught on fire>
Origin of IMPERTURBABLE
Middle English, from Late Latin imperturbabilis, from Latin in- + perturbare to perturb
First Known Use: 15th century
Definition source: http://www.merriam-webster.com
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