inflexible

Inflexible is an adjective meaning not able to bend or adapt; it is applied to both physical objects and abstract ideas. A material described as inflexible resists deformation under stress, exhibiting high stiffness. A schedule, stance, policy, or approach described as inflexible leaves little room for modification or compromise.

The word comes from Latin inflexibilis, from in- 'not' + flexibilis 'capable of bending' (from flexus, from flectere 'to bend'). In modern English, inflexible is commonly used to describe people or systems in a critical or neutral way, depending on context.

Common synonyms include rigid, unyielding, uncompromising, obstinate; antonyms are flexible, adaptable, pliable. The term can carry a negative connotation when applied to individuals or organizations, implying stubbornness or an unwillingness to consider new information, though it can be neutral in technical contexts.

Inflexibility also exists as a noun inflexibility and as an adverb inflexibly.

Examples: An inflexible work schedule made it hard to accommodate emergencies. The metal's inflexibility meant it could not absorb the impact. Governments may face criticism for inflexibility when reform is necessary.