Added 10 October 2026 ruthlessness noun Categories: Describing WordsFeelingsRare Words noun ! Definition from Wiktionary (CC BY-SA). More about ruthlessness at Wordnik → Where our words come from → The property of being ruthless. Related Words: pitilessnessmercilessnesscrueltyinhumanitymeannesswickednessbarbaritybrutalityferocityrudenessrigorousnessruthfulness Back to today's word