blind

The word’s core meaning is a person’s loss of sight, either partly or fully. That can be temporary or permanent, and can come from injury, congenital conditions, disease, or age. In this literal sense it is a concrete medical and everyday condition.

Its figurative range is much wider. A person may be blind to the obvious, ignoring evidence that others notice, or blinded by love/rage/ambition when emotion or desire blocks judgment. In these uses, the word points to a gap in understanding, awareness, or moral sight rather than physical vision.

It is also used for fairness-by-design in evaluation systems. A blind review means the assessor does not know the identity of the person being reviewed, helping reduce bias. A blind audition is judged on performance alone, and a blind date pairs people who have not met or seen each other.

In places and objects, the word marks obstruction or lack of access: a blind alley is a dead-end passage, while a blind spot is a gap in what one can see or detect. These technical uses keep returning to the same root idea: a limit in what can be perceived, whether by senses, knowledge, or design.

So the word moves between literal and figurative perception: it can describe missing eyesight, missing awareness, or missing bias, depending on context.