DISCONCERT

[verb] - to make (someone) feel suddenly uncertain and worriedHis visit to his mother in hospital disconcerted him. [T]They were disconcerted by his strange replies. [T]The family was disconcerted at the unexpected news. [T]The reply disconcerts, causes awkwardness. [I]We were disconcerted to be told, "You can't be trusted". [+ to infinitive]