composure
self-control / poise / calmness / serenity
Noun
This term describes a psychological state of stability and self-regulation. It carries a connotation of strength and discipline, suggesting a deliberate effort to suppress panic or anger to maintain a professional or dignified exterior. As an uncountable noun, it does not have a plural form and cannot be counted with numbers. To quantify it, one must use partitive constructions such as a sense of composure or a degree of composure.