How do you know if you are unable to define it?I do not reject the Biblical penal substitution.
I think you may just like the label "penal substitution".
Do you reject RC Sproul's theory?
My sin was placed upon him. And the one who was pure was pure no more. And God cursed him. It was as if there was a cry from heaven — excuse my language, but I can be no more accurate than to say — It was as if Jesus heard the words, ”God damn you.” Because that’s what it meant to be cursed. To be damned. To be under the anathema of the Father.