1. the quality or state of being heavy or substantial in weight
2. the quality of being large, bulky, or muscular in build

Examples

• The heftiness of the suitcase made it difficult to lift onto the shelf.
• He was surprised by the heftiness of the stone when he tried to move it.
• The heftiness of the book suggested it contained hundreds of pages.
• Despite his heftiness, the athlete moved with surprising grace.
• The heftiness of the wooden door required two people to hang it properly.