From an adjective: This is a redirect from an adjective, which is a word or phrase that describes a noun, to a related word or topic.
Mentioned in a hatnote: This is a redirect from a title that is mentioned in a hatnote. The mention is usually at the top of the target article, but it may also be mentioned in a section hatnote or in another article's hatnote.
The titles of redirects mentioned in hatnotes may refer to a subject other than that of the target page. It is possible that this redirect may need to be retargeted, or become an article in its own right (see {{R with possibilities}}), or it may be a good candidate for a Wiktionary link.