Food that is prepared and served quickly at relatively low cost, typically sold at chain restaurants (e.g., burgers, fries).
朝は忙しくて、よくファストフードで済ませる。
I'm often busy in the morning and often settle for fast food.
子どもたちはファストフードのハンバーガーが大好きだ。
Children love fast-food hamburgers.
健康のために、ファストフードの頻度を減らそうと思う。
For my health, I plan to cut down on how often I eat fast food.
週末は家で作るけど、平日はついファストフードに頼ってしまう。
I cook at home on weekends, but on weekdays I end up relying on fast food.