Adverb
in an impassive manner
Source: WordNetWhat had he been taught? For the social good, you must be your own policeman and witness. You must assume responsibility for any crime which might conceivably be yours. The face of the informer stared impassively at him. It was Barrent's own face, reflected back from a mirror on the wall. Robert Sheckley
The row of dolls watched her impassively from the bookshelf, their tea party propriety almost certainly offended. Holly Black
he submitted impassively to his arrest Source: Internet
He looked straight ahead impassively as the guilty verdicts were read. Source: Internet
McKie stood impassively in the dock, closing his eyes for several seconds after the verdict was delivered. Source: Internet
Seehorn’s character, observing impassively, registers only because she’s the only woman at the table. Source: Internet