Of Reform Judaism, its tenets, or its adherents.

Obstinate and unruly; strongly opposed to something. / Not affected by great heat. / (medicine) Difficult to treat. / (biology) Incapable of registering a reaction or stimulus.

A material or piece of material, such as a brick, that has a very high melting point.

(transitive, archaic) To hold back, to restrain (someone or something). / (reflexive, archaic) To show restraint; to hold oneself back.

The chorus or burden of a song repeated at the end of each verse or stanza. / (by extension) A much repeated comment, complaint, or saying.

(grammar) In English: a personal pronoun, having a form of "self" as a suffix to show that the subject's action affects the subject itself.

(cricket) an administrative official who decides on any penalties for bad conduct etc

(physics) A frame of reference that is stationary relative to a body moving at constant velocity and on which no force is being exerted.

A set of assumptions, ideas and standards that form a viewpoint from which philosophical, religious and other ideas may be evaluated.

(intransitive, of light) To change direction as a result of entering a different medium / (transitive, optics) To cause (light) to change direction as a result of entering a different medium.