Added 10 October 2026 mercilessly /ˈmɜːsɪləslɪ/ adverb Categories: Describing WordsRare Words adverb ! Definition from Wiktionary (CC BY-SA). Pronunciation from Wiktionary, via Kaikki.org. More about mercilessly at Wordnik → Where our words come from → In a merciless manner. She mercilessly read off the list of his wrongs in front of their friends. Related Words: pitilesslyunmercifullyremorselesslyruthlesslyrecklesslyindiscriminatelyrelentlesslyinexorablycruellyunscrupulouslyseverelyharshly Back to today's word