self-contained

adj.

[1]	self-possessed , unemotional , self-controlled , in control , composed , serene , peaceful , calm , tranquil , cool , collected , even-tempered , detached , imperturbable , unruffled , undisturbed , unperturbed , controlled , placid , grave , serious , sober , solemn , (Colloq) unflappable
[2]	reserved , collected , equanimous , controlled , distant , poised , self-collected , aloof , formal , self-possessed , withdrawn , reticent , standoffish
[3]	whole , entire , complete , stand-alone , unitary