"character or quality of being prosy," 1814, from prosy + -ness.
Entries linking to prosiness
prosy adj.
"like prose," hence "dull, tedious," 1814 (in a letter of Jane Austen), from prose + -y (2). Related: Prosiness.
-ness
word-forming element denoting action, quality, or state, attached to an adjective or past participle to form an abstract noun, from Old English -nes(s), from Proto-Germanic *in-assu- (cognates: Old Saxon -nissi, Middle Dutch -nisse, Dutch -nis, Old High German -nissa, German -nis, Gothic -inassus), from *-in-, originally belonging to the noun stem, + *-assu-, abstract noun suffix, probably from the same root as Latin -tudo (see -tude).