That person being is referred to as a "homebody" - the one who seldom goes anywhere and who prefers to stay at home.
Find out 13 Things Homebodies Say And What They Actually Mean from ThoughtCatalog.com.
But if someone to stay indoors all day almost all the time, it can be a sign of depression and social anxiety.
Shelter is a basic human need. But staying indoors all day may fuel anxiety, insomnia and that too-familiar sense that humans just aren’t meant to spend the whole day inside.
You miss a lot when you surround yourself with walls, and sunlight tops the list. Exposure to sun-strength rays helps calibrate your body’s circadian “clock”, which regulates everything from appetite and sleep schedules to mood and energy levels, says Kenneth Wright, director of the Sleep and Chronobiology Laboratory at University of Colorado, Boulder.
Find how you can overcome the depression and low self esteem caused by staying inside a lot at ShynessSocialAnxiety.com.