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

1.
desconcertar, perturbar, inquietar
disturb the composure of; unsettle.
:
•
The sudden change in his behavior disconcerted her.
El cambio repentino en su comportamiento la desconcertó.
•
He was disconcerted by the unexpected question.
Se sintió desconcertado por la pregunta inesperada.