Related Clues:
- Back Head to show severity
- Southern bird over promontory - serious nature!
- Muscular cramp
- Grimly serious quality
- Stiff, irresponsive state
- Chilled shivering often a symptom of disease
- Quality of a good math proof
- Back head of uncompromising nature
- - - mortis
- Extreme effort
- Inflexible nature
- -- mortis, stiffness of a dead body
- Leniency's opposite
- Demanding standard
- Inflexible accuracy