Usage patterns
身勝手な〈人〉a selfish person
He's always said to be a selfish person.
身勝手な行動を取るto take selfish action
She acted selfishly without considering those around her.
身勝手な言い訳をするto make a selfish excuse
He always makes selfish excuses.
身勝手に〈動詞〉to do something selfishly
He always behaves selfishly.