IPA: /ɪmˈpɜːrtəˌbəl/
KK: /ɪmˈpɜːrtərbəl/
Someone who is very calm and does not get upset or excited easily, even in difficult situations.
Despite the chaos around her, she remained imperturbable and focused on her work.
Imperturbable is formed from "im-" (meaning not) and "perturbare" (meaning to disturb). The word describes a state of being not disturbed or agitated, indicating calmness and composure under pressure.
Think of someone who is 'not' ('im-') 'disturbed' ('perturbare') by chaos around them — that's why imperturbable means unshakably calm.