6 adjectives to describe impassivity

"This is a hard experience, Hornby," said Thorndyke, when we three were, for a few moments, left apart from the others; and as he spoke the warmth of a really sympathetic nature broke through his habitual impassivity.

With a sudden return to his customary wooden impassivity, he shook hands with us, bowed stiffly, and took himself off towards the curator's office.

They stood stock still, watching us with a dreadful impassivity which was more frightening to me than violence.

But mere impassivity had replaced it.

As he stood there facing the western afterglow, the profound impassivity of his expressiona look that seemed to scorn all this infidel civilization of an upstart racegrew deeper.

With a sudden return to his customary wooden impassivity, he shook hands with us, bowed stiffly, and took himself off towards the curator's office.

6 adjectives to describe  impassivity