1. not able to bend or be forced out of shape; stiff
2. very strict and difficult to change; inflexible in attitude or behavior

Examples

• The metal frame was completely rigid and wouldn’t bend.
• She held her body rigid with fear.
• The school has rigid rules about uniforms.
• His rigid thinking prevented him from considering new ideas.
• The rigid plastic container cracked when dropped.
• The company’s rigid policies frustrated many employees.
• The board became rigid in cold weather.