threathening or clouding come to mind
The word "shade" implies darkening. So, yeah, it probably is.
Yes. Darkening is most commonly used as a verb, but it can be an adjective. In a sentence like "Under the darkening clouds" it is an adjective.
Darkening Sky was created on 2010-10-22.
Mona on Darkening Ground was created in 2001.
Fugue for a Darkening Island was created in 1972.
Fugue for a Darkening Island has 125 pages.
The Darkening - 2012 is rated/received certificates of: USA:R
The Darkening - 1995 is rated/received certificates of: USA:PG-13
The ISBN of Mona on Darkening Ground is 1-58297-220-6.
The ISBN of Fugue for a Darkening Island is 0-450-01575-0.
You can buy room darkening curtains from online stores such as amazon and ebay. On these sites you will be able to search for the ideal room darkening curtains to suit you.