The term 'BIG VAST OUTDOORS' is a phrase used to describe the vastness of nature and the OUTDOORS. It is often used to emphasize the beauty and grandeur of the natural world, and to encourage people to explore and appreciate it. The crossword solutions for this term are 'VAST, ' which is an adjective meaning very large in size or extent. This word accurately describes the enormity of the OUTDOORS, and emphasizes its beauty and grandeur.