The Oxford Thesaurus An A-Z Dictionary of Synonyms - self-containedadj.

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unflappable: Sometimes I think Frank is a little too self-contained. 2) reserved, controlled, distant, aloof, formal, withdrawn, reticent, standoffish: Gregory is so self-contained that he did not tell anyone that he was ill, not even his wife. 3) whole, entire, complete, stand-alone, unitary: The house has been divided into five self-contained apartments.