Adjective futile has 2 senses
  1. futile, ineffectual, otiose, unavailing - producing no result or effect; "a futile effort"; "the therapy was ineffectual"; "an otiose undertaking"; "an unavailing attempt"
    Antonyms: useful, utile (indirect, via useless)
  2. bootless, fruitless, futile, sleeveless, vain - unproductive of success; "a fruitless search"; "futile years after her artistic peak"; "a sleeveless errand"; "a vain attempt"
    Antonym: productive (indirect, via unproductive)
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