adjective
barren of results
efforts to convince him were futile
Synonyms: abortive, bootless, fruitless, ineffective, ineffectual, unavailable, unavailing, unprevailing, unproductive, useless, vain
Related Word: empty, hollow, idle, nugatory, otiose; inadequate, inefficacious, inefficient, insufficient; unsatisfactory, unsuccessful
Idioms: in vain, no dice, of no avail, to no effect
Contrasted words: effectual, efficacious, fruitful; advantageous, beneficial, profitable
Antonyms: effective