Longman Dictionary of Contemporary English homepage

Date: 1300-1400
Language: Old French
Origin: perturber, from Latin perturbare

perturbed

 adjective
     
per‧turbed formal
worried about something that has happened or will happen:
William looked a little perturbed.
perturbed by/at/about
He didn't seem perturbed by the noises outside.
perturbed that
He was perturbed that she didn't look happy.
—perturb verb [transitive]
My unexpected arrival didn't perturb him in the least.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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