Serenely self-possessed; calm. See Synonyms at cool.(adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "composed" in a sentence
"Her expression composed itself to instant formality, and she tilted her head."
"Cody stared at his green pencil, engraved with the Mirador Marlin and an acronym composed of the first letters of the ESLR headings."
"The Vulcan stepped inside, his expression composed but his tone hesitant."