
verwundern
to surprise
To cause surprise or astonishment in someone.
Seine plötzliche Kündigung hat uns alle sehr verwundert.
His sudden resignation surprised us all very much.
to surprise
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to surprise
To cause surprise or astonishment in someone.
Seine plötzliche Kündigung hat uns alle sehr verwundert.
His sudden resignation surprised us all very much.

to be surprised
To be surprised or astonished about something.
Ich verwundere mich, dass er immer noch nicht hier ist.
I am surprised that he still isn't here.
'Verwundern' (to surprise) is an inseparable verb that goes back to 'wundern' (to surprise / to wonder). The prefix 'ver-' always stays attached to the verb and is not separated. The verb often sounds somewhat more formal or written than 'wundern' (to surprise / to wonder).
Es verwundert mich nicht, dass er die Prüfung bestanden hat.
It doesn't surprise me that he passed the exam.
It is important to distinguish the active and reflexive forms. 'Etwas verwundert jemanden' (something surprises someone) means that something triggers surprise. 'Sich über etwas verwundern' (to be surprised about something) means that a person is surprised.
Sein Verhalten verwundert mich sehr.
His behavior surprises me very much.
A very common construction is the impersonal sentence with 'es' (it). The structure is: 'Es verwundert [Person im Akkusativ], dass ...' (It surprises [person in the accusative] that ...). This expresses that a certain fact is surprising to someone.
Es verwundert mich, dass du das nicht wusstest.
It surprises me that you didn't know that.
to surprise
Both verbs work when unexpected news triggers a reaction. „Überraschen“ focuses more on the unexpected event or arrival. „Verwundern“ emphasizes the surprise or astonishment it causes. Use „überraschen“ when referring mainly to the event and „verwundern“ when referring mainly to its surprising effect.

Die ungewöhnliche Nachricht über den Termin verwunderte mich am frühen Morgen.
The unusual news about the appointment surprised me early in the morning.
Die Nachricht über den Termin überraschte mich am frühen Morgen.
The news about the appointment surprised me early in the morning.