Vicarious is an adjective that describes the feeling of experiencing something through another person's perspective. It is often used to describe a situation in which one person experiences something indirectly, such as watching a movie or reading a book. The term can also be used to describe a situation in which one person experiences something that another person has experienced. In this case, the crossword solution 'ARMCHAIR' is a perfect fit, as it implies someone sitting back and observing something from a distance.