| adjective | incapable of or resistant to bending “a rigid strip of metal” |
| adjective | incapable of compromise or flexibility |
| adjective | incapable of adapting or changing to meet circumstances “a rigid disciplinarian” |
| adjective | designating an airship or dirigible having a form maintained by a stiff unyielding frame or structure |
| adjective | fixed and unmoving; ; - Connor Cruise O'Brien “with eyes set in a fixed glassy stare” |
| rigidness | noun | the physical property of being stiff and resisting bending |
| rigidity | noun | the physical property of being stiff and resisting bending |
| stiffness | noun | the property of moving with pain or difficulty |
| strictness | noun | uncompromising resolution |
| inflexibility | noun | the quality of being rigid and rigorously severe |
| fixedness | noun | remaining in place |
| fixity | noun | the quality of being fixed in place as by some firm attachment |