Is Imperturbable a Real Word?

incapable of being upset or agitated; not easily excited; calm: imperturbable composure.

What is a imperturbable?

: marked by extreme calm, impassivity, and steadiness : serene.

Can imperturbable people?

The definition of imperturbable is someone that is not easily upset, angered or affected. A level-headed person who doesn't generally get upset by things is an example of someone who is imperturbable. Unshakably calm and collected. That cannot be disconcerted, disturbed, or excited; impassive.