Yossarian missed Nurse Duckett so much that he went searching hungrily through the streets for Luciana, whose laugh and invisible scar he had never forgotten, or the boozy, blowzy, bleary-eyed floozy in the overloaded white brassiere and unbuttoned orange satin blouse whose naughty salmon-colored cameo ring Aarfy had thrown away so callously through the window of her car.
There are no more uses of "callous" in the book.
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She displays a callous indifference to others’ suffering.
Callous as they were to my suffering, they were equally callous to their own when anything befell them.