matter-of-fact
matter-of-fact {adj.}
1. Simply telling or showing the truth; not explaining or telling more.
The newspaper gave a matter-of-fact account of the murder trial.
2. Showing little feeling or excitement or trouble; seeming not to care much.
When Mary's father died she acted in a very matter-of-fact way.
He was a very matter-of-fact person.
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Source: A Dictionary of American Idioms