noun, noun which may take the genitive case particle 'no'
dark blue; deep navy blue
Refers to a very dark shade of blue, often used for fabrics, uniforms, or formal wear. Functions as both a noun and a no-adjective.
彼は濃紺のスーツを着て会議に出席した。
He attended the meeting wearing a dark blue suit.
この学校の
This school's uniform is dark blue.