
unerwartet
unexpected
Describes something that happens surprisingly or that one did not expect.
Sein Besuch kam völlig unerwartet.
His visit came completely unexpectedly.
unexpected
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unexpected
Describes something that happens surprisingly or that one did not expect.
Sein Besuch kam völlig unerwartet.
His visit came completely unexpectedly.
The word consists of the prefix 'un-', which expresses negation, and 'erwartet' (expected), the past participle of 'erwarten' (to expect). So it literally means 'not expected'.
Wir bekamen eine unerwartete Rechnung.
We received an unexpected bill.
'Unerwartet' (unexpected) can stand as an adjective before a noun or as an adverb that describes a verb. As an adverb, it remains unchanged.
Das war ein unerwarteter Erfolg.
That was an unexpected success.
Common combinations are 'unerwarteter Besuch' (unexpected visit), 'unerwartete Kosten' (unexpected costs), or 'eine unerwartete Nachricht' (an unexpected message). It is often intensified by adverbs like 'völlig' (completely) or 'ganz' (quite/completely).
Durch den Sturm entstanden unerwartete Kosten für die Reparatur.
The storm caused unexpected repair costs.
suddenly
Both words can describe a surprising event that was not expected. „Unerwartet“ emphasizes the lack of expectation, while „plötzlich“ also highlights that the event happened quickly and abruptly. Use „unerwartet“ when the surprise is important, and „plötzlich“ when the timing or speed is the main point.

Während wir warteten, kam unerwartet der Hausmeister herein.
While we were waiting, the janitor unexpectedly came in.
Während wir warteten, öffnete sich plötzlich die Tür.
While we were waiting, the door suddenly opened.