Polite
If there aren’t wrinkles around his eyes and the corners of his mouth point toward his jaw (not his ears), he’s probably only being nice.
Contemptuous
Is he smiling with just one side of his mouth? Yes, it could be a charmingly crooked grin, but he could also be feeling scornful or superior.
Sensitive
A polite smile with the inner corners of his eyebrows pointing up can indicate sadness or disappointment; chances are, he’s empathetic.
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