futility

he raged at the futility of it all.

the futility of unrealistic ambitions

She could see the utter futility of trying to protest.

The futility of trying to change his mind was evident.

She realized the futility of arguing with him.

The futility of their efforts became apparent.

He felt a sense of futility in his job.

The futility of war was evident in the devastation it caused.

She was tired of the futility of her attempts to please everyone.

They finally accepted the futility of their project.

The futility of chasing after material possessions became clear to him.

He was frustrated by the futility of searching for a solution.

The futility of worrying about things out of his control weighed heavily on him.