uselessly

He was uselessly trying to fix the broken computer.

She uselessly searched for her lost keys in the dark.

The uselessly long meeting could have been an email.

I uselessly tried to persuade him to change his mind.

The uselessly complicated instructions confused the students.

She uselessly waited for a response that never came.

He uselessly argued with the stubborn customer.

The uselessly heavy suitcase was a pain to carry around.

She uselessly tried to calm down her crying baby.

The uselessly expensive dress was way out of my budget.