- heaviness, weightiness - the property of being comparatively great in weight; "the heaviness of lead"
--1 is a kind of weight
Antonyms: lightness, weightlessness
--1 has particulars:heft, heftiness, massiveness, ponderousness, ponderosity; preponderance - thickness, heaviness - used of a line or mark
--2 is a kind of wideness, broadness