Easy-peasy means “very easy” — so easy that it is almost a joke. Children say it a lot, and adults say it when they are being playful, or talking to children. It often comes with a little rhyme: easy-peasy lemon squeezy. You would not put it in a serious letter or an exam essay; it belongs in speech, games, and light chat. Though actually, if a grown-up says it to another grown-up about a hard job, it can sound as if they are making the job smaller than it is, or talking down. The feeling is bright and a bit babyish on purpose.

超簡單（小孩口吻）