IPA: /ˌʌn.pərˈtɜːrbd/
KK: /ʌnˈpɜrtɜrbd/
Calm and not affected by disturbances or worries.
She remained unperturbed despite the chaos around her.
Unperturbed → It is formed from "un-" (meaning not) and "perturbed" (from Latin "perturbare", meaning to disturb or confuse). The word "unperturbed" means not disturbed or not confused, indicating a state of calmness or tranquility.
Think of 'not' ('un-') being added to 'disturbed' ('perturbed') — this helps you remember that unperturbed means to remain calm and undisturbed.