When you do something lazily, you act in a slow, leisurely way, with as little effort as possible. For some, a perfect summer afternoon involves lying lazily in a hammock, reading a mystery novel.
If your parents tell you to hurry up so you don't miss the bus, you probably shouldn't lazily finish the last bites of your cereal. Acting lazily shows a lack of energy or motivation — and most of all, it's really slow. Word experts trace lazily and lazy back to the Middle Low German word laisch, "weak, feeble, or tired." After a long, exhausting day, you'll definitely want to flop lazily into bed.