Rottenest

adjective

1. 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."

2. In a state of decay.

   "His mouth stank and his teeth were rotten."

3. Cruel, mean or immoral.

   "That man is a rotten father."

4. Bad or terrible.

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