All 7 Uses

impassive
in
The Scarlet Pimpernel
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The moment he had disappeared, Chauvelin slipped into the room, and the next instant stood calm and impassive by her side.†
Chpt 14 *
He had allowed her to speak on in her own vehement, impassioned way, offering no comment, no word of sympathy: and now, while she paused, trying to swallow down the hot tears that gushed to her eyes, he waited, impassive and still.†
Chpt 16
"And to probe that love, you demanded that I should forfeit mine honour," he said, whilst gradually his impassiveness seemed to leave him, his rigidity to relax; "that I should accept without murmur or question, as a dumb and submissive slave, every action of my mistress.†
Chpt 16
She need not complain now that he was cold and impassive; his very voice shook with an intensity of passion, which he was making superhuman efforts to keep in check.†
Chpt 16
He was again as rigid, as impassive, as before.†
Chpt 16
Her woman's heart had read his, beneath the impassive mask his pride still forced him to wear.†
Chpt 17
Close to him Desgas still stood mute and impassive, waiting for further orders, whilst two soldiers were kneeling beside the prostrate form of Marguerite.†
Chpt 30

Definitions:

(1) (impassive)
having or revealing little emotion -- especially under circumstances others would find exciting
(2) (meaning too rare to warrant focus)