disconcert
US /ˌdɪs.kənˈsɝːt/
UK /ˌdɪs.kənˈsɝːt/

1.
desconcertar, perturbar, confundir
disturb the composure of; unsettle.
:
•
The sudden change in his behavior disconcerted her.
A mudança repentina em seu comportamento a desconcertou.
•
He was disconcerted by the unexpected question.
Ele ficou desconcertado com a pergunta inesperada.