self-contained (adj)

constituting a complete and independent unit in and of itself

"the university is like a self-contained city with shops and all amenities"

collected, equanimous, poised, self-collected, self-contained, self-possessed (adj)

in full control of your faculties

"the witness remained collected throughout the cross-examination"; "perfectly poised and sure of himself"; "more self-contained and more dependable than many of the early frontiersmen"; "strong and self-possessed in the face of trouble"

self-contained (Adjective)

Not requiring external or additional support; complete in itself.

self-contained

Self-sustainability and self-sufficiency are overlapping states of being in which a person or an organization needs little or no help from, or interaction with, others. Self-sufficiency entails the self being enough (to fulfill needs), and a self-sustaining entity can maintain self-sufficiency indefinitely. These states represent types of personal or collective autonomy. A self-sufficient economy is one that requires little or no trade with the outside world and is called an autarky.