dark-blue

The compound adjective 'dark-blue' is formed from two native English colour descriptors. 'Dark' originates from the Proto-Germanic derkaz, conveying absence of light, which evolved in Old English to describe deep, sombre hues. 'Blue' entered English via Old French from a Germanic root blæwaz, referring to the colour itself. The combination follows a common English pattern where an adjective ('dark') modifies a colour noun ('blue') to create a specific shade, literally meaning "a blue that is dark," demonstrating how English builds precise descriptive terms through straightforward compounding.

Structure: dark (deep, lacking light) + blue (colour) - dark: From Old English deorc, meaning "dark, obscure, gloomy." It functions as an adjective modifying the following colour. - blue: From Old French bleu, ultimately of Germanic origin, referring to the colour. It functions as the noun root specifying the colour.