unkosher

From un- + kosher.

unkosher (not comparable)

1. (somewhat informal, chiefly Judaism) Not kosher.
   • 1988 September 2, Florence Hamlish Levinsohn, “A Special Connection With God”, in Chicago Reader‎^[1]:

     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.

• treyf
• nonkosher