noun
a person who is unable to distinguish certain colors
adjective
unable to distinguish certain colors, typically green and red
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Individuals who are colour-blind may have difficulty distinguishing between certain shades of colors.
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My friend is colour-blind, so he always asks me to help him pick out matching outfits.
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Dude, I'm totally colour-blind when it comes to decorating my room.
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Being colour-blind to the signs of danger can lead to serious consequences.