When you do a bad thing. I don’t even know if that’s accurate, but if it is, there’s tons of problems with it because unless your actions and intentions are morally aligned, you’re an imperfect person in need of redemption. Also there’s no room in defining the aftermath as a part of the sin. Often I think Christians see sin as something you do that is immediately bad, not something that can be bad in the long term, which gets annoying.

There is no such thing as sin in that bad behavior will not require consequences in an afterlife. There is right and wrong, good and bad but not sin.... well maybe dark chocolate

A christian control construct.

The standard-issue explanation is it's "missing the mark", the mark or target or goal being god's perfection and his perfect standards.

In other words it's a mechanism to make you feel unworthy, guilty, wrong, etc.

Believing untruth.

Inobservances God's commands!

Murder, rape, torture, beating your wife/girlfriend-husband/boyfriend !!

Any action, statement, or thought that is not permitted by a religion

An immoral act considered to be a transgression against divine law.