Blacklisted
Generally blacklisted means banned or get rid of, usually blacklisted url is the one which has removed from a SERP(Search engine results page), and these banned sites are ignored by search engines. No search engines will prefer this blacklisted sites.

Broken Link
Broken link is commonly known as dead link. It means that broken link will not stay active for longer time. Actually search engines dislike broken links. One important part of ongoing optimization is keeping all of your site's links active, because it is very necessary when search engines finds your site.

Index
An index is a term which refers to Search Engine's database. Because it contains whole information that what crawler has recognized or identified, particularly copies of web pages. when user wants to find information in search engines then search engine uses its indexed pages and algorithm to provide a high ranked list of the most relevant pages. Because of this search engine's database it is ready to provide any information based upon the user query, with most effectively and accurately.