futile
1. [ adjective ] producing no result or effect
Synonyms: unavailing otiose ineffectual
Examples:

"a futile effort" "the therapy was ineffectual" "an otiose undertaking" "an unavailing attempt"

Related terms: useless
2. [ adjective ] unproductive of success
Synonyms: fruitless vain sleeveless bootless
Examples:

"a fruitless search" "futile years after her artistic peak" "a sleeveless errand" "a vain attempt"

Related terms: unproductive
Similar spelling:   fuddle