Flying light is a term used to describe something that is agile, nimble, or easily airborne. Its antonyms would describe something that is heavy, cumbersome, or grounded. Heavy items are typically less mobile and less easy to move around quickly. Cumbersome objects are awkward to handle and require significant effort to manage. Grounded objects are stationary or unable to be lifted off the ground. Examples of antonyms for flying light might include heavy, bulky, clumsy, earthbound, and ponderous. Each of these words conveys a sense of weight and immobility, which is the opposite of the agility and mobility suggested by the term flying light.