/ˈblu/
1.adj.of the color intermediate between green and violet; having a color similar to that of a clear unclouded sky
“October's bright blue weather”
2.adj.used to signify the Union forces in the American Civil War (who wore blue uniforms)
“a ragged blue line”
3.adj.filled with melancholy and despondency
“gloomy at the thought of what he had to face”