Weightless refers to a state in which an object or a person appears to have no weight or is without apparent weight. This can occur when an object is in free fall or when it is in a state of zero gravity, such as in space. In such a state, the object or person is not subject to the force of gravity, which is what gives objects weight on Earth. Weightlessness can also refer to a feeling of lightness or lack of pressure, such as when floating in water or when wearing lightweight clothing.