Blind means unable to see, either completely or partially. Someone who is blind might see nothing at all, or they might see only shapes, shadows, or light. Blindness can happen from birth or develop later in life from injury or illness.

People who are blind learn to navigate the world using their other senses. They might read using Braille, a system of raised dots felt with fingertips. They might use a white cane to detect obstacles, or work with a trained guide dog. Many blind people develop remarkably sharp hearing and touch, noticing details that sighted people miss.

The word also describes situations where you can't see temporarily or clearly. When you step from bright sunlight into a dark room, you're momentarily blinded until your eyes adjust. A car's headlights at night can blind you with their glare. Someone might close the curtains because the sun is blinding them.

Blind can also mean refusing to see or acknowledge something obvious. If you have a blind spot about your own mistakes, you don't notice them even when others do. When someone is blind to another person's feelings, they fail to recognize emotional signals that seem clear to everyone else.

In phrases like blind faith or blind trust, the word suggests accepting something without evidence or questioning. A blind taste test means sampling foods without knowing what they are, reducing the influence of sight and expectations.