self-contained

英 ['selfkən'teɪnd] 美['sɛlfkən'tend]

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;: "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"