self-contained

adjective

1. containing in oneself or itself all that is necessary; independent.
2. reserved or uncommunicative.
3. self-controlled or self-possessed.
4. (of a machine or mechanism) complete in itself.

adjective

1. containing within itself all parts necessary for completeness
2. (of a flat) having its own kitchen, bathroom, and lavatory not shared by others and usually having its own entrance
3. able or tending to keep one’s feelings, thoughts, etc, to oneself; reserved
4. able to control one’s feelings or emotions in the presence of others

adj.1590s, from self- + contained (see contain).