This is the 4314th most frequent Swedish word.
stulen
"Stulen" means "stolen" in English.
Here, 'stulen' is used as an adjective to describe the condition of the bicycle as having been stolen.
Jag hittade en stulen cykel i parken.
I found a stolen bicycle in the park.
In this sentence, 'stulen' is metaphorically used to express the feeling of loss or unfair appropriation referring to the idea.
Han kände sig stulen för att någon tog hans idé.
He felt stolen because someone took his idea.
'Stulen' serves as an adjective in this sentence, defining the past action of theft pertaining to the ring.