collected
You must do everything possible to stay cool, calm, and collected.
She remained calm and collected throughout the terrifying incident.
Everything was calm and collected and orderly.
He did not recognize this calm and collected woman as the same one who had ranted and raved at him a couple of days before.
She appeared calm and collected.她显得沉着镇定。

SMART Vocabulary: related words and phrases

Controlling emotions
anger management
blackmail
bottle
bottle something up
breaking point
choke
compose
cork
dysregulation
emotional blackmailidiom
fight back
frustrated
get beyond something
put on a brave faceidiom
repress
repressed
repression
self-possessed
self-possessedly
temperate