Misnagdim (מתנגדים; also Mitnagdim; singular misnaged/mitnaged) is a Hebrew word meaning "opponents". The term "Misnagdim" commonly refers to opponents of Hasidism. The term "Misnagdim" gained a common usage among Jews living in Europe as the term that referred to Ashkenazi Jews who opposed the rise and spread of early Hasidic Judaism.
The rapid spread of Hasidism in the second half of the 18th century greatly troubled many traditional rabbis; many saw it as heretical.
Hasidism's founder was Rabbi Israel ben Eliezer, known as the Baal Shem Tov ("master of a good name" usually applied to a saintly Jew who was also a wonder-worker), or simply by the Hebrew acronym "Besht" (bet-shin-tav); he taught that man's relationship with God depended on immediate religious experience, in addition to knowledge and observance of the details of the Torah and Talmud.
Much of Judaism was still fearful of the messianic movements of the Sabbateans and the Frankists (followers of the messianic claimant Jacob Frank (1726–1791)). Many rabbis suspected Hasidism of an intimate connection with these movements.
The characteristically "Lithuanian" approach to Judaism was marked by a concentration on highly intellectual Talmud study. Lithuania became the heartland of the traditionalist opposition to Hasidism, to the extent that in popular perception "Lithuanian" and "misnaged" became virtually interchangeable terms. In fact, however, a sizable minority of Lithuanian Jews belong(ed) to Hasidic groups, including Chabad, Slonim, Karlin (Pinsk) and Koidanov.