Impassive (adjective)

1. Not showing emotion or feeling.
2. Not easily excited or agitated.

Origin:

From latin impassibilis, from in- + passibilis capable of feeling.

Examples:

1. The impassive face of the statue gave no hint of the emotions it was meant to convey.
2. The doctor remained impassive, even as the patient's condition worsened.
3. The judge listened impassively to the defendant's plea.
4. The soldier"s face was impassive, he didn"t show any emotion.
5. The impassive expression on her face revealed nothing of her thoughts.