She had the quick notion that it was the first absolutely sincere smile he'd given her.

"I'm so pleased to finally meet you," she said with a sincere smile that made my teeth hurt.

She flashed him a reasonably good imitation of a sincere smile.

His reply was a nod and a sincere, if resigned, smile.

He gave me one of his rare sincere smiles and headed for the kitchen.

She stood up and gave me the terribly sincere smile of a slick little liar.

George offered her one of his more sincere smiles.

With his friendly and sincere smile, he makes friends easily.

"Go on," George said with a smile more or less sincere.

She offered him the first sincere smile of the day.