serious

It does, however, stand as one more sign of how unserious Congress has become about governing.

He made an amusing and not altogether unserious reference to the American habit of exploding enthusiasm in dangerous fireworks.

Once she began as if they were wholly serious, and once again as if they had been wholly unserious.

A lot of the girls have been sick a little with colds and small and unserious diseases in the past year.

Still, we were both born as we are, and I've just as much right to be unserious as you have to be serious.

His own father was an unscrupulous, unserious man, that was true, but at any rate he had given his son a human chance.