Related Clues:
- Hard to combine, chemically
- Nonreactive, as some gases
- Like dead weight
- Nonreactive, chemically
- Like a dead weight
- Hard to get a reaction out of?
- Like a noble gas
- Chemically unreactive
- Motionless, still
- Sluggish and inactive
- Slow, dull
- Lethargic, sluggish
- Motionless or lifeless
- Lifeless or static
- Motionless or inanimate