"state of being decayed or putrid, process of natural decomposition of animal or vegetable matter," mid-14c., from rotten + -ness. From c. 1400 as "decayed or decaying matter."
Entries linking to rottenness
rotten adj.
c. 1300, roten, of animal substances, "in a state of decomposition or putrefaction," from a Scandinavian source akin to Old Norse rotinn "decayed," past participle of verb related to rotna "to decay," from Proto-Germanic stem *rut- (see rot (v.)).
Of vegetable substances from late 14c. Also used in North America of weak, melting ice (1660s). The figurative sense of "morally corrupt, wicked; unsound in character or quality" is from late 14c.; the weakened slang sense of "bad" is recorded by 1880.
Rotten apple is from a saying traced back to at least 1528: "For one rotten apple lytell and lytell putrifieth an whole heape." The Rotten Row in London and elsewhere probably is from a different word, but one of uncertain origin. Rotten-hearted is attested by late 14c.
-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).