frum
adj.— «“All of a sudden they decided this side of the town is not for them, they needed to go to the other side, because they’re more frum,” she said, using the Yiddish word for religious.» —“Two neighborhoods reveal Orthodox community’s fault lines” by Amy Klein Jewish Journal (Los Angeles, California) Nov. 10, 2006. (source: Double-Tongued Dictionary)
Further reading
If there’s a logophile on your gift list, you have lots of choices, including a new trivia game for language-lovers and a murder mystery for the word-obsessed. Plus, if someone calls you a schmoozer, should you be flattered or insulted? And if...
Mona from Riverview, Florida, grew up understanding that the word schmooze, which comes from Yiddish, meant simply “to mingle and chat” at parties, but when she fondly referred to her friend as a schmoozer, the friend was insulted, assuming that a...
The word is from the German “fromm,” meaning pious. “Frum” is an adjective for Orthodox Jews. A person who is frum is a “frummie.” I’ve heard the latter mostly in reference to women or to groups, not usually to men. It can be a neutral descriptive term or a mildly disdainful one about a person more religious than oneself.