Frum
Frum (Yiddish: פֿרום, lit. 'religious', 'pious') is a word that describes Jewish religious devotion.
The term connotes the observance of Jewish religious law in a way that often exceeds its bare requirements. This not only includes the careful study of Torah, daily prayers, observing Shabbat, kashrut, and the rules of tzniut, and performing deeds of loving-kindness, but also many more customs and khumrot (prohibitions or obligations in Jewish life that exceed the requirements of Halakha).
The term frum contrasts with frei (Yiddish: פֿרײַ, romanized: fray, lit. 'free'), which describes Jews who do not practice Orthodox observance.