n.
1.
Rigidity, inflexibility, rigidness, rigor, hardness, starkness.
2.
Thickness, spissitude, density, compactness, denseness, consistence.
3.
Stubbornness, obstinacy, pertinacity, contumaciousness, inflexibility.
4.
Severity, rigor, strictness, harshness, rigorousness, austerity, sternness.
5.
Formality, precision, constraint, primness, frigidity.
6.
Tension, tenseness.
7.
Torpidness, torpor, rigidity.