This is the 3519th most frequent Dutch word.
onverwachts
Unexpected.
The word 'onverwachts' here implies the sudden and unanticipated occurrence of the storm.
De onverwachts opkomende storm verraste alle wandelaars.
The unexpectedly rising storm surprised all the hikers.
In this sentence, 'onverwachts' is used to describe the unforeseen nature of the friends' visit.
We kregen onverwachts bezoek van oude vrienden.
We unexpectedly received a visit from old friends.
Here, 'onverwachts' denotes the unplanned and sudden event of the power failure.