A website of untranslatable words

I enjoy browsing this website of 500+ words that don’t translate, because I’m always intrigued by the concepts I had no idea existed, like “qarrtsiluni,” a North Alaskan Inupiatun word for sitting in the darkness, waiting for inspiration to strike you, or “ razbliuto,” a Russian word to describe the feeling for someone you used to love but no longer do, or “vellichor,” which I think may be made up but is a much needed word to address “the strange wistfulness of used bookstores.” It’s weird how once I learn a word for something I was hardly aware of before that I can instantly recall feeling it in the past. I would like to know the word for that. — CD