No.

In Jainism, there is no sin that is absolutely and eternally unforgivable. But every action has karmic consequence, and some very grave karmas can be extremely difficult to purify. Their effects are not erased by pardon; they are removed through true repentance, pratikraman, repentance with restraint, penance, and right conduct.

So the strictest Jain answer is:

No sin is permanently unforgivable, but no sin is consequence-free.