He is facing economic dire straits.

He is in serious danger.

Do you understand the seriousness of this problem?

This problem is very serious.

This year is my unlucky year, so I need to be especially careful.

He walked without realizing the trap he had fallen into.

He ended up falling into that trap.

He is having trouble solving math problems.

He is in his unlucky year, so he needs to be particularly careful.

He seemed to be in trouble.