unavailing (adjective)

1. Despite all his heroic efforts, the superhero's unavailing attempts to defeat the villain left the city in chaos.

2. The wizard's spell was unavailing, and the enchanted forest remained locked in eternal darkness.

3. In the suspenseful thriller, the detective's unavailing search for the missing evidence led to a shocking plot twist.

4. The artist's unavailing attempts to capture the beauty of the sunrise on canvas left him feeling frustrated and uninspired.