A permanent little grin seemed fixed on his congenial features.

I had a permanent grin on my face about it all.

His mouth seemed frozen in a permanent grin.

Jim emerges with a slash that inflicts a sort of permanent grin on his face.

Somebody asks what sort of man was this Paul with the permanent crooked grin?

He had freckles, a wide-eyed look, and a permanent grin.

His mouth, oddly and deceptively, seems fixed in a permanent grin.

The fellow had a permanent grin pasted on his face.

After a few days he began to go around with a more or less permanent grin on his face, but nobody could discover the joke.

I wore a permanent grin the first half of the race, high-fiving children along the course and enjoying the live music.