Superfluous
• At leisure
• Futile
• Good-for-nothing
• Idle
• Indolent
• Ineffective
• Lazy
• Like a couch potato
• No-account
• Of little use
• Of no use
• Pointless
• Purposeless
• Serving no purpose
• Shiftless
• Slothful
• Unemployed
• Useless
• Vain
• Worthless