Definitions

1. adjective

having a dark blue or bluish-black color

“The blueblack evening sky was a breathtaking sight.”

2. noun

a type of dark blue-black color or pigment

“The artist mixed the blueblack paint with water to create the perfect shade.”

3. adverb

in a dark blue-black color or to a dark blue-black degree

“The tree stood blueblack against the grey sky.”