She smiled innocuously-at variance with her words. At this point he could not...

She smiled innocuously-at variance with her words. At this point he could not discern her degree of seriousness. A topic of world-shaking importance, yet dealt with facetiously; an android trait, possibly, he thought. No emotional awareness, no feeling-sense of the actual meaning of what she said. Only the hollow, formal, intellectual definitions of the separate terms.
And, more, Rachael had begun to tease him. Imperceptibly she had passed from lamenting her condition to taunting him about his.