An object is weightless when it is:

Weightlessness is the experience of having no apparent weight. This occurs when an object is in freefall, meaning it is falling under the sole influence of gravity. In this state, the object and its occupants are accelerating towards the Earth at the same rate, creating a sensation of weightlessness. This is why astronauts in orbit around the Earth experience weightlessness, as they are constantly in freefall towards the Earth, but their horizontal velocity keeps them from crashing into it.