egotistically, miserly, stingily, greedily, in one's own interest, meanly, cannily, ungenerously, illiberally, unchivalrously, to gain private ends, lacking in generosity, lacking in magnanimity, lacking in consideration; see also wrongly 1, 2.
Every child misbehaves and will sometimes act selfishly and hurtfully.
The North was outstripping the South in population and wealth, and already by the tariff acts was, as he believed, selfishly levying taxes for its sole benefit.
No doubt by the prohibition to levy the smallest taille the feudal lords escaped direct taxation; but from the day when the privileged classes selfishly allowed the taxing of the third estate, provided that they themselves were exempt, they opened the door to monarchic absolutism.
Those who are too hungry to wait shall eat at home; and not put to shame those who have no houses (and presumably not enough food either), by bringing their viands to church and selfishly eating them apart.