earth tone
Synonym discussion
Sense: noun/1
All three describe quiet, easy-to-live-with colours, but they differ in feel. An earth tone is warm and soil-like — browns, tans, rusts, and olive greens that remind you of wood, clay, and dry leaves. A neutral is a wider group of low-key shades, including cool greys and soft creams, so every earth tone is roughly neutral but many neutrals (a cool grey, for example) are not earth tones. A pastel is pale and often cool — baby pink, mint, powder blue — made by adding lots of white, so it feels light and sweet rather than warm and grounded. Designers pick earth tones for a cosy, natural room, neutrals for a clean modern look, and pastels for something soft and playful, as in 'She chose earth tones for the den but pastels for the nursery.'
Etymology
A modern compound from 'earth', meaning the soil and ground (Old English 'eorþe'), and 'tone', meaning a shade of colour (from Greek 'tonos', a stretching or pitch, later borrowed into colour vocabulary). The phrase became common in 20th-century design and fashion writing to name colours that look like natural ground materials.
First known use
1973
1973, in the meaning defined above