Antonyms of noun uselessness

1 sense of uselessness

Sense 1
inutility, uselessness, unusefulness -- (the quality of having no practical use)
       Antonym of usefulness (Sense 1)
      => utility, usefulness -- (the quality of being of practical use)

Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun uselessness

1 sense of uselessness

Sense 1
inutility, uselessness, unusefulness -- (the quality of having no practical use)
       => quality -- (an essential and distinguishing attribute of something or someone; "the quality of mercy is not strained"--Shakespeare)