blueness

From blue +‎ -ness.

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blueness (usually uncountable, plural bluenesses)

1. The quality or characteristic of being blue in color.

   Coordinate term: bluishness

   • 1905, H. G. Wells, Empire of the Ants:

     In an atlas, too, the land is man's, and all coloured to show his claim to it — in vivid contrast to the universal independent blueness of the sea.

2. Melancholy.

   Synonyms: blues; see also Thesaurus:sadness