Matter-of-fact (adjective)

1. Calm, straightforward, and unemotional in manner or behavior.
2. Not involving or showing emotion.

Origin:

The phrase "matter-of-fact" is a combination of "matter" which means "something that is important or significant" and "fact" which means "something that is known to be true or real", together the phrase means "something that is important or significant because it is true or real.

Examples:

1. She gave the bad news in a matter-of-fact tone.
2. He was matter-of-fact in his approach to the problem.
3. The doctor gave the diagnosis in a matter-of-fact manner.
4. He spoke in a matter-of-fact tone about the accident.
5. She was matter-of-fact about the situation.