English speakers have been using verdant as a ripe synonym of green since at least the 16th century, and as a descriptive term for inexperienced or naïve people since the 19th century. (By contrast, the more experienced green has colored our language since well before the 12th century, and was first applied to inexperienced people in the 16th century.) Verdant comes from the Old French word for "green," vert, which itself is from Latin virēre, meaning "to show green growth" or "to be green." Today, vert is used in English as a word for green forest vegetation and the heraldic color green. A related word is virescent, meaning "beginning to be green."