serious attention
serious consideration
serious thought

The aircraft out of the future did not seem to need any serious attention.

He was someone to whom the system needed to pay serious attention.

City needs serious attention from the government for the growth and development.

He can go to the President and get serious attention paid.

Then Tom gave his serious attention to what had happened in the engine room.

But are we to give serious attention to such things?

Yet this is the only international issue to get serious attention in the Senate race.

This is, therefore, an issue to which States must pay serious attention.

We must give this debate much more serious attention over the next few months.

The next time I needed serious medical attention was quite a different experience.