Added 10 October 2026 heftiness noun Categories: Describing WordsObscure Words noun ! Definition from WordNet 3.1, Princeton University. More about heftiness at Wordnik → Where our words come from → Possessing muscular strength. The property of being large in mass. Related Words: heftponderousnessmassivenessponderosityheavinessweightinessweightfulnessgravityheavy-handednessfattishnesstopheavinessbulkiness Back to today's word