WordWeb Online

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
    
3. Disinclined to work or exertion
   "otiose kings under whose rule the country languished"
   - fainéant, indolent, lazy, slothful, work-shy

See also: idle, useless, worthless