Added 9 October 2026 mellowing noun Categories: ActionsRare Words noun ! Definition from WordNet 3.1, Princeton University. More about mellowing at Wordnik → Where our words come from → The process of becoming mellow. Related Words: softripeningagingageingmellowednessmollificationramollescenceamollishmentemolliencegivingemollitionemollient Back to today's word