rotten

The definition of rotten is someone or something extremely bad, corrupt, spoiled, unpleasant or decaying.

(adjective)

A bad attitude is an example of something that would be described as a rotten attitude.
A person who is bad at tennis is an example of someone who would be described as a rotten tennis player.
A public official who accepts bribes is an example of a rotten individual.
Food with mold growing on it is an example of something that would be described as rotten.

See rotten in Webster's New World College Dictionary

adjective

in a decayed or decomposed state; spoiled, putrefied, tainted, etc.
having a bad odor because of decomposition or decay; putrid; foul-smelling
morally corrupt or offensive; dishonest, open to bribery, etc.
unsound or weak, as if decayed within
soft or easily broken as because of decomposition; friable: said of rocks, ice, etc.
Slang very bad, unsatisfactory, nasty, etc.

Origin: ME roten < ON rotinn < IE *reud- < base *reu-, to tear, rip open (> rude): prob. used orig. of flax left to soak and rot

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