self-possessed self-possessed /ˌsɛlf pəˈzɛst/

adjective

1. In full control of your faculties  ( collected , equanimous , poised , self-collected , self-contained , self-possessed )
   in full control of your faculties
    The witness remained collected throughout the cross-examination
   the witness remained collected throughout the cross-examination
    Perfectly poised and sure of himself
   perfectly poised and sure of himself
    More self-contained and more dependable than many of the early frontiersmen
   more self-contained and more dependable than many of the early frontiersmen
    Strong and self-possessed in the face of trouble
   strong and self-possessed in the face of trouble