'Rigidness' definitions:

Definition of 'rigidness'

(from WordNet)
noun
The physical property of being stiff and resisting bending [syn: rigidity, rigidness]
noun
The quality of being rigid and rigorously severe [syn: inflexibility, rigidity, rigidness] [ant: flexibility, flexibleness]

Definition of 'Rigidness'

From: GCIDE
  • Rigidness \Rig"id*ness\, n. The quality or state of being rigid. [1913 Webster]