infructuous

his efforts to negotiate were ultimately infructuous.

the committee's discussions proved to be infructuous.

she found his attempts to persuade her infructuous.

the project was deemed infructuous after several months of work.

despite their hard work, the results were infructuous.

his infructuous attempts to solve the problem frustrated everyone.

many of their strategies were ultimately found to be infructuous.

her infructuous inquiries left her feeling disheartened.

the search for a solution was long and infructuous.

they realized that their efforts were infructuous and decided to change direction.