Merriam-Webster's Collegiate® Dictionary, 11th Edition
ROTTEN
I. adjective
Etymology: Middle English roten, from Old Norse rotinn; akin to Old English rotian to rot
Date: 13th century
having rotted ; putrid , morally corrupt, extremely unpleasant or inferior , very uncomfortable , of very poor quality ; lousy , abominable , rottenly adverb rottenness noun
II. adverb
Date: 1880
to an extreme degree