Banned
Isolated and ignored by search engines. Those site operators who attempt to gain position or monopolize search engine results by unscrupulous means, such as spamming or deceiving spiders with content different from what human visitors see run the risk of being permanently (or temporary) banned from a search engine's results.
A banned site may try to send a search engine a re-inclusion request. After review and removal of any spam methods from the site, the site may be returned to the search engines results.
A re-inclusion for Google can be done via the Google Webmaster tools section. Read more in this excellent article from Webconfs.com about re-inclusion in Google.
