What does "imperturbably" mean?

In an imperturbable manner; calmly.

Imperturbably

Common synonyms include: calmly, detachedly, dispassionately, objectively, phlegmatically, placidly.

adv

adv ·Rare ·Advanced level

Adverb

1
In an imperturbable manner; calmly.
"‘Are you an alienist?’ I interrupted. ‘Every doctor should be - a little,’ answered that original, imperturbably."

"‘Are you an alienist?’ I interrupted. ‘Every doctor should be - a little,’ answered that original, imperturbably."

From imperturbable + -ly.