Etymology
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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.

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Definitions of rotten

rotten (adj.)
very bad;
Synonyms: icky / crappy / lousy / shitty / stinking / stinky
rotten (adj.)
damaged by decay; hence unsound and useless;
rotten floor boards
Synonyms: decayed / rotted
rotten (adj.)
having decayed or disintegrated; usually implies foulness;
dead and rotten in his grave
From wordnet.princeton.edu