Unemployment is one of the serious problems of India.
She is afflicted with a serious disease.
My mother scolds me only when I do some serious mistake.
Noise pollution is a serious health hazard.
Rising pollution is a serious threat to human life.
How much serious reading have you done?
It is not such a serious matter as you are taking it.
War has serious impact on the environment.
Are you serious?
I am serious about it?
Choosing a career is a serious task.