self-contained

adjectives

constituting a complete and independent unit in and of itself

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

is similar to

having every necessary or normal part or component or step

"a complete meal"; "a complete wardrobe"; "a complete set of the Britannica"; "a complete set of china"; "a complete defeat"; "a complete accounting"

complete

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"

collected, equanimous, poised, self-collected, self-contained, self-possessed