Definition from Wiktionary, the free dictionary
unkosher (not comparable)
- (somewhat informal, chiefly Judaism) Not kosher
1988 September 2, Florence Hamlish Levinsohn, “A Special Connection With God”, in Chicago Reader:
- There are, according to Penansky, 4,000 ways a mezuzah can be "unkosher" (illegitimate): the parchment may tear or curl, a letter may have weakened.