"fruitless" in the adjective sense
1. bootless, fruitless, futile, sleeveless, vain
unproductive of success
"a fruitless search"
"futile years after her artistic peak"
"a sleeveless errand"
"a vain attempt"
Source: WordNet® (An amazing lexical database of English)
Princeton University "About WordNet®."
WordNet®. Princeton University. 2010.
View WordNet® License