Related Clues:

• One of 16 useless people
• Deceased
• Like helium and neon
• Slow to react
• Underattended, say
• Not reactive, as some gases
• Immobile, as a gas
• Not moving and that's it finally!
• "The ___ Pool" (Eastwood flick)
• Dead to the world, as a chemical
• Still upset (but not very)
• ___ gas
• Having lately joined a certain choir? Absolutely
• Not exactly active
• Like a useless battery