Related Clues:

• Perfectly still
• Like liquid nitrogen
• "How's the new diet coming, ___?"
• Like oxygen
• Unable to react, as helium
• Like 103-Down
• Chemically nonreactive
• Phlegmatic
• Couchbound, perhaps
• Utterly lethargic
• Chemically quiet
• Hard to get a reaction out of
• Unable to react chemically
• Neither solid nor liquid
• Hard to combine, chemically