possessed adj. composed, cool, serene, placid, collected, self-assured, peaceful, calm, tranquil, even-tempered, detached, imperturbable, unruffled, undisturbed, unperturbed, controlled, dignified, refined, Colloq unflappable Considering what she has been through, Tanya is quite self-possessed for a teenager
SELF
Meaning of SELF in English
Oxford thesaurus English vocab. Английский словарь Оксфорд тезаурус. 2012