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self-contained

3 syllables

Quick answer

As an adjective, self-contained means constituting a complete and independent unit in and of itself.

Meanings of self-contained

2 meanings

Constituting a complete and independent unit in and of itself
“the university is like a self-contained city with shops and all amenities”
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”
Similar: collected, equanimous, poised, self-collected, self-possessed

Meanings from Wiktionary (CC BY-SA 4.0) and Open English WordNet (CC BY 4.0).

adjective: in full control of your faculties

collectedequanimouspoisedself-collectedself-possessed