1. Too old to be useful
   - overage, overaged, superannuated

See also: old

• sulfur
• sulfur bacteria
• sulfur bottom
• sulfur butterfly
• sulfur dioxide
• sulfur hexafluoride
• sulfur mine
• sulfur mustard
• sulfur oxide
• sulfur paintbrush
• sulfur-yellow
• sulfurette
• sulfuretted
• sulfuric
• sulfuric acid
• sulfurised
• sulfurized
• sulfurous
• sulfury
• Sulidae
• sulindac
• sulk
• sulkily
• sulkiness
• sulky