Blind describes someone who cannot see at all or very well. It can also mean unaware of something important.
It comes from Old English “blind,” meaning “sightless” or “confused,” and is related to words in other Germanic languages with similar meanings. The sense of being mentally or emotionally unaware developed later.
We often say things like “blind to the truth,” using a physical disability as a metaphor for ignorance. Modern speakers are becoming more aware of this and sometimes avoid such metaphors to be more respectful.
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