rigid

the word 'rigid' entered english in the late 15th century from the latin adjective 'rigidus', which itself derives from the verb 'rigēre', meaning 'to be stiff or numb'. this latin root can be traced further back to the proto-indo-european base reig-, signifying 'to stretch tightly' or 'to be tense', a concept intimately linked with stiffness. the semantic journey is remarkably direct: from the physical sensation of tautness and inflexibility, the meaning expanded metaphorically to describe rules, systems, or attitudes that are equally unbending and resistant to change. thus, the modern english word retains the core sense of its ancient ancestors, applicable to both physical objects and abstract principles.

the word 'rigid' is a simplex form. it is a direct borrowing from latin 'rigidus', meaning 'stiff, hard, unbending'. the latin root is 'rigēre', meaning 'to be stiff'.