
verschwunden
gone / disappeared
No longer present or findable; lost or gone.
Mein Schlüssel ist spurlos verschwunden, ich kann ihn nirgends finden.
My key has disappeared without a trace; I can't find it anywhere.
gone / disappeared
Loading your saved state.

gone / disappeared
No longer present or findable; lost or gone.
Mein Schlüssel ist spurlos verschwunden, ich kann ihn nirgends finden.
My key has disappeared without a trace; I can't find it anywhere.
'Verschwunden' (gone / disappeared) is the past participle of the verb 'verschwinden' (to disappear). It is very often used like a normal adjective to describe a state.
Das Auto ist über Nacht einfach verschwunden.
The car simply disappeared overnight.
Since 'verschwunden' (gone / disappeared) comes from the verb 'verschwinden' (to disappear), which describes a change of state, it is always combined with the auxiliary verb 'sein' (to be). So you say 'er ist verschwunden' (he has disappeared) or 'sie war verschwunden' (she had disappeared / she was gone).
Als ich zurückkam, war meine Tasche verschwunden.
When I came back, my bag was gone.
Common adverbs that intensify 'verschwunden' (gone / disappeared) are 'spurlos' (without leaving a trace), 'plötzlich' (suddenly), or the idiom 'vom Erdboden verschwunden' (vanished from the face of the earth).
Der Dieb war spurlos mit dem Geld verschwunden.
The thief had disappeared without a trace with the money.
lost
Both words say that something can no longer be found. „Verloren“ suggests that the owner no longer has the item, while „verschwunden“ states that it is absent and leaves the cause open. If the loss is known, „verloren“ is appropriate; for unexplained absence, „verschwunden“ is the better fit.

Meine Schlüssel sind verschwunden, und ich weiß nicht, wo ich sie gelassen habe.
My keys have disappeared, and I don't know where I left them.
Meine Schlüssel sind verloren, weil ich sie im Zug liegen ließ.
I lost my keys because I left them on the train.