IPA: /ʌnˈbliːtʃt/
KK: /ʌnˈbliːtʃt/
Not treated with chemicals to remove color or whiten it, often used to describe natural materials or products.
I prefer to use unbleached flour for my baking because it retains more nutrients.
Unbleached → It is formed from "un-" (meaning not) and "bleached" (from Old English "bleacan", meaning to make white or to bleach). The word "unbleached" means not made white or not bleached.
Think of 'not' ('un-') making something 'white' ('bleached') — that's why unbleached refers to something that hasn't been whitened.