rotten

Of perishable items, overridden with bacteria and other infectious agents.

“If you leave a bin unattended for a few weeks, the rubbish inside will turn rotten.”

In a state of decay.

“His mouth stank and his teeth were rotten.”

Cruel, mean or immoral.

“That man is a rotten father.”

Bad or terrible.

“It was a rotten idea to take the boat out today.”

To an extreme degree.

“That kid is spoilt rotten.”