Reclusive (adjective)

Tending to avoid being with other people.

Origin:

From the latin word "recludere" meaning "to shut up".

Examples:

1. He was so reclusive that he never left his house.
2. The reclusive artist only gave one interview in her lifetime.
3. The reclusive author wrote novels in solitude.
4. The reclusive nature of the creature made it hard to study.
5. Reclusive behavior can be a symptom of social anxiety disorder.