Linguistic discovery of the day

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So we were discussing the matter of how people are perceived by others versus what their character is actually like. And somebody mentioned that I come across as being nicey nicey and unassertive at first, she said, I think it's because you're quite... frum. She fumbled for the word, and decided it didn't exist in English. But I got very excited as she was defining it for me because it turns out that the Swedish word frum means exactly the same as the Yiddish word, the lack of which I frequently deplore in English: religious in the sense of being committed to the rules and formal observances of the religion. Like pious but more specific. Cool, huh?