Seating himself, the professor gave a shrewd smile, then shook his head.

Treat supplied a shrewd, self-approving smile, a specialty with him.

Instead of his usual shrewd smile, the old man laughed heartily.

His lips hardened into a shrewd smile as he recalled his experiences.

The shrewd smile on his face showed that he was learning facts that suited him.

He gave me a shrewd smile and a typical gesture of his head.

Reading the first report, Hebler gave a shrewd smile.

Then a shrewd smile came over the big-shot's darkened features.

She smiled one of those shrewd little smiles that women wore when they wanted to fuddle a man.

Then a shrewd smile showed on whitened lips beneath the black false beard.