What is one action that you can never forgive by others?

is not for me to forgive or not forgive, is for God to do that.

Treason

Nothing. My religion is all about forgiving.

No crime that is considered unforgivable.

G-d is kind and merciful, and is willing to forgive any sin so long as there is genuine repentance.

False accusations.

Forgive & Forget is the best policy. :)

Everyone should be forgiven and be given a second chance. My friend, don't ask this question.

nothing God is the forgiver

nothing is unforgivable. even the people who commit the most vile crimes are broken individuals deserving of compassion.

Disrespect? I was thinking more like someone killing my family.