Definition of unperturbedness in English:

unperturbedness

noun

  • The state or condition of being unperturbed; unflappability, composure.

Origin

Late 17th century; earliest use found in Matthew Hale (1609–1676), judge and writer. From unperturbed + -ness.

Pronunciation

unperturbedness

/(ˌ)ʌnpəˈtəːbədnəs/