I looked around and up at Mr. Cunningham, whose face was equally impassive.
Atticus was standing under the street light looking as though nothing had happened: his vest was buttoned, his collar and tie were neatly in place, his watch-chain glistened, he was his impassive self again.
There are no more uses of "impassive" in the book.
Show samples from other sources
He remained impassive, showing neither interest in nor concern.
A fleeting expression crossed the Special’s impassive face—annoyance mixed with suspicion.