A sweet way to convey an incapacity for empathy in a self-involved giddy girl.  A butterfly goes about its business, meaning no harm, but oblivious to those around it.

‘Young souls, in such pleasant delirium as hers, are as unsympathetic as butterflies sipping nectar.’

Source: George Eliot, Adam Bede (Harmondsworth: Penguin, 1985 (1859)), p. 146

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