Rigid, meaning inflexible or stiff, is a word that signifies a lack of adaptability and conformity to changes. Synonyms for rigid include words like unyielding, stiff, firm, unbending, and immutable. Each of these words indicates a certain degree of resistance to change and a tendency to maintain one's position regardless of the circumstances. Other synonyms for rigid could include words like inflexible, unchangeable, intractable, resolute, and immovable. These words all convey a sense of unwavering commitment to a particular point of view or way of doing things. Regardless of which synonym is used, the idea of rigidness implies an unwillingness to compromise or change course.