self-possessed

[self-puh-zest, self-] /ˈsɛlf pəˈzɛst, ˌsɛlf-/
adjective
1.
having or showing control of one's feelings, behavior, etc.; composed; poised.
Origin
1830-40
Related forms
self-possessedly
[self-puh-zes-id-lee, -zest-lee, self-] /ˈsɛlf pəˈzɛs ɪd li, -ˈzɛst li, ˌsɛlf-/ (Show IPA),
adverb
unself-possessed, adjective
Synonyms
calm, collected, serene, cool, sedate.
Examples from the web for self-possessed
  • He was not distinguished looking but was self-possessed.
British Dictionary definitions for self-possessed

self-possessed

adjective
1.
having control of one's emotions, etc
Derived Forms
self-possessedly, adverb
self-possession, noun