1. to show or display a lack of worry, interest, or care about something
He demonstrated unconcern about the critical reviews of his film.
Ele demonstrou desinteresse pelas críticas adversas do seu filme.
2. to behave in a way that suggests indifference or apathy toward a situation
She demonstrated unconcern by shrugging and walking away.
Ela demonstrou desinteresse dando de ombros e se afastando.