
grau
gray
The color that is a mixture of black and white.
Der Himmel war heute von morgens bis abends grau und bewölkt.
The sky was gray and cloudy today from morning to evening.
gray
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gray
The color that is a mixture of black and white.
Der Himmel war heute von morgens bis abends grau und bewölkt.
The sky was gray and cloudy today from morning to evening.

gray
In a figurative sense, monotonous, bleak, joyless, or boring.
Nach dem Urlaub fiel es ihm schwer, wieder in den grauen Alltag zurückzufinden.
After the vacation, he found it hard to return to gray everyday life.

gray
Refers to hair that has lost its original color with age and has become white or gray.
Mein Großvater ist schon mit vierzig Jahren grau geworden.
My grandfather went gray when he was only forty.

gray
Describes an area that is not clearly defined legally or morally; an unclear intermediate zone.
Der Handel mit diesen digitalen Gütern bewegt sich in einem grauen Markt.
Trade in these digital goods takes place in a gray market.

gray theory
A fixed expression for a theory that is very abstract and far removed from real life, with little practical use.
Deine Vorschläge klingen gut, aber das ist alles nur graue Theorie und in der Praxis nicht umsetzbar.
Your suggestions sound good, but it's all just gray theory and can't be put into practice.
The meaning of 'grau' (gray) depends strongly on the noun it describes. A 'grauer Himmel' (gray sky) refers to the color, while a 'grauer Alltag' (gray everyday life) describes a bleak mood.
Ich mag meinen neuen grauen Mantel sehr.
I really like my new gray coat.
In a figurative meaning, 'grau' (gray) often describes something monotonous, boring, or joyless. A 'graue Maus' (gray mouse), for example, is an inconspicuous, shy person.
Das Leben in der kleinen Stadt war ihm zu grau und ereignislos.
Life in the small town was too gray and uneventful for him.
When referring to people, 'grau' (gray) almost always describes hair color in old age. The expression 'grau werden' (to go gray) means that the hair loses its natural color.
Mein Vater ist stolz auf seine grauen Haare.
My father is proud of his gray hair.
In the context of laws or rules, 'grau' (gray) describes an unclear, not clearly defined area. Typical combinations are 'Grauzone' (gray area) or 'grauer Markt' (gray market).
Der Handel mit diesen Produkten bewegt sich in einer rechtlichen Grauzone.
Trade in these products takes place in a legal gray area.
'Graue Theorie' (gray theory) is a fixed expression for ideas that are very abstract and far removed from real life. It is often used as the opposite of practical application ('Praxis').
Das ist doch alles nur graue Theorie, das funktioniert im echten Leben nie.
That's all just gray theory; it would never work in real life.
white
Both words can be appropriate for very light hair that has turned that way with age. Grau usually describes the typical condition of hair in old age, while weiß places more emphasis on the visibly very light color. Use grau for the usual description of aging and weiß when the color looks especially light.

Seit einigen Jahren trägt er sein graues Haar ganz kurz.
For several years now, he has kept his gray hair very short.
Im hohen Alter war ihr Haar fast vollständig weiß.
In old age, her hair was almost completely white.