To an extreme degree.

Of perishable items, overridden with bacteria and other infectious agents. / In a state of decay. / Cruel, mean or immoral. / Bad or terrible.

The quality of being rotten.

plural of rottenness

comparative form of rotten: more rotten

(historical) A borough that was represented in Parliament although it had very few voters.

plural of rotten borough

plural of rotten egg

(slang, idiomatic, humorous, childish) A person who is the latest, the last, or the slowest in a group at performing a certain task, especially at going to a certain place.

(mineralogy) A soft stone used in artistic grinding and polishing, and for cleaning metallic substances. The name is also given to other friable siliceous stones applied to similar uses.