self–pos·sessed 
/ˌsɛlfpəˈzɛst/ adjective
/ˌsɛlfpəˈzɛst/ adjective [more self–possessed; most self–possessed] : having or showing control of your feelings or actions especially in a difficult situation
▪ She is a remarkably calm and self-possessed young woman.
▪ She is a remarkably calm and self-possessed young woman.
— self–pos·ses·sion /ˌsɛlfpəˈzɛʃən/ noun [noncount]
/ˌsɛlfpəˈzɛʃən/ noun [noncount]
