His nasty grin faded when he took in the expression on her face.

I didn't like the nasty grin upon his face.

I gave her my nasty grin still one more time.

Mark's mustache turned up as he broke into a nasty grin.

"Now you know how I feel," he said, flashing a nasty grin.

I looked at him and felt my face pull into a nasty grin, "Or the rest of it."

"Come on in and join the party," Jack said with a nasty grin.

I knew my teeth were showing in a nasty grin.

Seeing my fear, Al split his lips in a nasty grin.