i Register
In some senses, composure is marked as obsolete. Watch for register when choosing this word.
ADJ
cool, perfect
VERB + COMPOSURE
keep, maintain
lose
When the referee made that unfair call, the coach lost his composure and received a red card.
recover, regain
ruffle
The rude comments from the audience didn't ruffle her composure during the presentation.
PREP
with ~
Even after the accident, he spoke with remarkable composure to the police officer.