matter-of-fact

matter-of-fact
ˌmatter-of-ˈfact adjective
showing no emotion when you are talking about something exciting, frightening, upsetting etc
    matter-of-fact about
    Jan was surprisingly matter-of-fact about her divorce.
    matter-of-fact voice/tone
    Use a matter-of-fact tone when disciplining your children.
—matter-of-factly adverb