inoperative (adj.)

• barren
• bootless
• broken
• counterproductive
• effete
• empty
• etiolated
• fatuous
• feckless
• fruitless
• futile
• haywire
• inadequate
• inane
• inapplicable
• ineffective
• ineffectual
• inefficacious
• inoperable
• invalid
• nonfunctional
• nugatory
• otiose
• sterile
• unavailing
• unemployable
• unfit
• unhelpful
• unsuitable
• unusable
• unworkable
• useless
• vain