English
imperturbably
From imperturbable + -ly.
A compound of imperturbable + -ly
Latin perturbō ‘to confuse’
Late Latin perturbabilis ‘perturbable’
Late Latin imperturbābilis
Middle English imperturbable ‘undisturbed’
English imperturbable
Today it means
adv In an imperturbable manner; calmly.
Language periods are conventional ranges, not dates for this word.
Etymograph / imperturbably