Related Clues:

• Like many loafers
• Lacking energy
• Well fixed
• Like noble gases
• Listless
• Lethargic, perhaps
• Like radon
• Unlikely to leave the couch
• Like krypton and xenon
• Languid
• Inanimate
• Feckless
• Lacking liveliness
• Like neon and xenon
• Like neon and argon