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Adjective: otiose  'ow-shee,ows or 'ow-tee,owz or 'ow-tee,ows
  1. Serving no useful purpose; having no excuse for being
    "otiose lines in a play";
    - pointless, purposeless, senseless, superfluous, wasted
  2. Producing no result or effect
    "an otiose undertaking";
    - futile, ineffectual, unavailing, meaningless
  3. Disinclined to work or exertion
    "otiose kings under whose rule the country languished";
    - fainéant [archaic], indolent, lazy, slothful, work-shy

See also: idle, useless, worthless