Collected
Part of speech: verb
Definition: To gather together; amass.
Part of speech: adjective
Definition: Cool-headed, emotionally stable, in focus.
Example sentence: Controlled aggression, to me, is one of the most important traits to have. To have that social intelligence to know when to exert aggression in the military environment, and when to stay calm, cool, and collected.
Self-possessed
Part of speech: adjective
Definition: in full control of one's faculties, and having a firm belief in one's abilities; confident, assured and poised