What is the opposite of a lovable curmudgeon?

Yes, and usually there is an official whose job it is to see and penalize such infractions.

Sure. The "rules" of Christianity don't regulate what kind of personality you must have, you are free to be a curmudgeon if you like.

I don't think there is exactly an opposite. If you think of al dente as "just right," then you could contrast it with "poco cotta" (undercooked) and "stracotto" (overcooked).

Definitely! What matters is that you're making time to spend with your partner instead of just passing each other by.

Yes. The valley fold is the exact opposite of a mountain fold. For the mountain fold, the middle goes up, and for the valley fold, the middle goes down.