pastel
Synonym discussion
Sense: adjective/1
For colour words, pastel suggests a light shade with a gentle, often cheerful look. It is common in fashion, room design, and packaging. Pale is broader: skin, light, and colour can all be pale, and the word does not always sound attractive. Soft can describe colour too, but it also talks about sound, light, or style, so it is less exact. Muted means not strong in colour, often with a calmer or more controlled effect than pastel. A pastel pink baby blanket sounds sweet and light, while a muted pink office wall sounds quieter and more restrained. If you simply mean not dark, pale may be enough; if you want a delicate design feeling, pastel is usually better.
Etymology
Pastel came into English from French pastel, which came from Italian pastello, a word linked to pasta, meaning paste. The name reflects the way coloured powder is mixed with a binder and shaped into drawing sticks. From the art material, English later developed the colour sense for light, gentle shades.