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Adjective: self-contained  self kun'teynd
  1. Constituting a complete and independent unit in and of itself
    "the university is like a self-contained city with shops and all amenities"
  2. In full control of your faculties
    "more self-contained and more dependable than many of the early frontiersmen";
    - collected, equanimous, poised, self-collected, self-possessed

See also: complete, composed

Encyclopedia: Self-contained