self-contained
adjective
[ ˌsɛlfkənˈteɪnd ]
• (of a thing) complete, or having all that is needed, in itself.
• "every section of the painting is a self-contained unit"
Opposite:
linked,
• (of a person) quiet and independent; not depending on or influenced by others.
• "he's very self-contained"
Similar:
independent,
standing on one's own two feet,
self-sufficient,
self-reliant,
introverted,
undemonstrative,
quiet,
private,
aloof,
insular,
reserved,
unemotional,
uncommunicative,
reticent,
secretive,