her manner assumed a dispassion and dryness very unlike her usual tone.
Examples of dispassion
dispassion
You thought science was all about dispassion, objectivity, open-minded logic?
From the guardian.co.uk
But judges are supposed to approach each case before them with dispassion.
From the economist.com
Maintaining a degree of dispassion is another of Maixner's survival skills.
From the smh.com.au
The Judith of our painting is going about her task with cold dispassion.
From the independent.co.uk
Dispassion and irony, the twin shields of the modern age, are not part of their makeup.
From the nytimes.com
I remained grim-faced, faking dispassion in hopes of seeming strong.
From the atwar.blogs.nytimes.com
Even if the CRU researchers were the model of scientific dispassion, these schemes are pointless.
From the kansas.com
Despite Winkler's careful dispassion, the reader can tell he is not happy with the status quo.
From the sfgate.com
It is an impassioned show, not least when it is attacking the media's dispassion on the subject.
From the time.com
More examples
Objectivity and detachment; "her manner assumed a dispassion and dryness very unlike her usual tone"
Freedom from passion; an undisturbed state; apathy
Such as giving the cold shoulder or phony smiles, looking unconcerned, sitting on the fence while others sort things out, dampening feelings with substance abuse, overeating, oversleeping, not responding to another's anger, frigidity, indulging in sexual practices that depress spontaneity and ...
The soul has three powers aspects, that is: the intelligent power, the appetitive and the irascible power. The last two constitute what is called the passible aspect of the soul. Dispassion, then, is not the mortification of the passible aspect of the soul but its transfiguration. ...
Freedom from or lack of strong feeling, calmness; free from the influence of passion; cool. calm and composed.