Words similar to selfish

Example sentences for: selfish

How can you use “selfish” in a sentence? Here are some example sentences to help you improve your vocabulary:

These "selfish" genes could do just as much for themselves by encouraging you to instead spend your money on the beggar outside the department store.
Selfish Prohibitionists
But I can't understand encouraging others to be selfish, which is the entire purpose of organizations like Zero Population Growth.
Consider the opening to "The End of the World," which introduces an angry son who, as the story goes on, will be called to Paris to care for a selfish dying father:
Either the whole A-ATPase catalytic subunits was transferred, or the intein alone spread as a selfish genetic element.