Related Clues:
- Like a dead weight
- Insistent
- Unwilling to move
- Hard to get a reaction out of?
- Like a noble gas
- Stubborn and unyielding
- Chemically unreactive
- Motionless, still
- Hard and unrelenting
- Definite and unyielding
- Motionless or lifeless
- Lifeless or static
- Positive and unrelenting
- Insistent, inflexible
- Inflexible, obdurate