IPA: /dɪs.kəmˈpəʊ.ʒər/
KK: /dɪsˈkəmˌpɔʊʒər/
A state of being upset or agitated, often due to a loss of calmness or control.
She tried to maintain her composure, but the unexpected news caused her discomposure.
Discomposure is formed from "dis-" (meaning apart or away) and "composure" (from Latin "componere", meaning to put together or arrange). The word describes a state of being taken apart from one's usual calmness or arrangement, leading to a lack of composure.
Think of being 'taken away' from your usual calmness ('dis-') — that's why discomposure means a state of being unsettled.