1. lacking the ability to bend or flex; rigid or inflexible
Usage: technical or formal usage; often used in medical, engineering, or anatomical contexts

Examples

• The patient's flexionless knee joint required surgical intervention.
• The material proved to be flexionless and unsuitable for the application.
• A flexionless spine would severely limit a person's mobility.
• The engineer designed a flexionless support structure for maximum stability.
• The flexionless nature of the metal made it difficult to shape.