Sentence:  Eight or ten years ago , a couple of French hoods stole a <WSD>priceless</WSD> Khmer head from the Musee Guimet , in Paris , and a week later crawled into the Salpetriere with unmistakable symptoms of leprosy . 
Meaning of the word marked with <WSD> tags:  having incalculable monetary, intellectual, or spiritual worth