This is the 1163rd most frequent Dutch word.
verdwenen
"Verdwenen" means "disappeared."
"Verdwenen" here is used as a past participle to indicate that the keys have vanished or are missing.
De sleutels zijn verdwenen, ik kan ze nergens vinden.
The keys have disappeared; I cannot find them anywhere.
In this example, "verdwenen" describes the state of the bird, implying that it was there before but is now absent.
Hij keek om zich heen, maar de vogel was verdwenen.
He looked around, but the bird was gone.
Here, "verdwenen" illustrates an action where the book seems to have vanished mysteriously or unexpectedly.