Translation guide
In Japanese, the English word 'pastel' is used in several ways: to describe soft, light colors; to refer to the art medium (pastel crayons/chalks); and in compound terms for pastel-colored things. The most common and natural way to express 'pastel' as a color is the loanword パステル, often combined with カラー or used as a prefix.
Describing a color that is soft, pale, or light, like pastel pink, pastel blue, etc.
The most common way to say 'pastel' as a color. Often used as a noun or prefix. Can stand alone or combine with color names.
パステルカラーが好きです。
I like pastel colors.
パステルピンクのワンピースを着ています。
She is wearing a pastel pink dress.
Means 'pastel-toned' or 'in pastel shades'. Used to describe an overall pastel look.
この部屋はパステル調でまとめられています。
This room is decorated in pastel tones.
Literally 'pale/light color'. A native Japanese alternative to パステル, though slightly broader. Can be used for any light, faint color.
淡い色の花が咲いています。
Pale-colored flowers are blooming.
Loanword 'soft color', sometimes used in fashion or design contexts, but less common than パステル.
ソフトカラーのニットが流行っています。
Soft-colored knits are in fashion.
Referring to the art supply: pastel sticks or chalks used for drawing.
Same loanword, used for the art medium. Context usually makes the meaning clear.
パステルで絵を描くのが趣味です。
My hobby is drawing with pastels.
Means 'pastel drawing/painting' as an artwork.
Naming a specific pastel color, like 'pastel green' or 'pastel yellow'.
Prefix パステル + color name. Very productive and natural.
パステルグリーンの壁が爽やかですね。
The pastel green walls are refreshing.
パステルイエローのブラウスを買いました。
I bought a pastel yellow blouse.
Prefix 淡い (pale) + color name. More native Japanese feel, but less specifically 'pastel'.
淡いブルーの空が広がっています。
A pale blue sky stretches out.
パステル is a very common loanword and is understood by most Japanese speakers. It's safe to use in both casual and formal contexts when talking about colors. For the art medium, context will clarify whether you mean the color or the crayon.
パステル specifically implies a soft, milky, often trendy pastel shade. 淡い simply means 'pale' or 'light' and can describe any faint color, including faded or washed-out tones. Use パステル for the fashionable, cute pastel aesthetic.
パステルカラーのスイーツが人気です。
Pastel-colored sweets are popular.
淡い色のTシャツはすぐ色あせる。
Pale-colored T-shirts fade quickly.
彼女は部屋をパステル調に飾りました。
She decorated her room in pastel tones.
パステルで絵を描いてみたいです。
I want to try drawing with pastels.
I saw beautiful pastel paintings at the exhibition.