Where Does the Word Unperturbed Come from?

Some people are terrified of flying on airplanes, while most remain completely unperturbed, even during bumpy, turbulent flights. When you're perturbed, you're bothered, from the Latin root perturbare, "to confuse, disorder, or disturb." When you're unperturbed, you stay cool.

What do unperturbed mean?

: not worried, upset, or disquieted : not perturbed continued unperturbed by the interruption.

What does Perterd mean?

: to cause (someone) to be worried or upset. See the full definition for perturb in the English Language Learners Dictionary. perturb. verb.