1.
[syn: collected, equanimous, poised, self-collected, self-contained, self-possessed]
The Collaborative International Dictionary of English v.0.48:
Self-possessed \Self"-pos*sessed"\, a.
Composed or tranquil in mind, manner, etc.; undisturbed.
[1913 Webster]
WordNet (r) 3.0 (2006):
self-possessed
adj 1: 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";
"strong and self-possessed in the face of trouble" [syn:
collected, equanimous, poised, self-collected,
self-contained, self-possessed]