I looked up frum and frey. I found frum — devout or observant of the 613 Jewish commandments — but all I got for frey was something out of Norse mythology. What is the Jewish/yiddish meaning of frey?
I’m no expert; I had just heard the term in reference to a girl from an Orthodox Jewish group that was called very frum, and I think it was Wikipedia that explained it to me - and in the same article there it talked about how the opposite was frey, which I’d guess was Yiddish from the German word frei, meaning free, here as in ‘laissez faire’, liberal, or libertine if taken to an extreme.