Relentless/rɪˈlentləs/ Definition 1 of 2Pro Tip 1/3Emotional Intensity Relentless often indicates strong, unwavering emotions driving someone's actions. He had a relentless determination to improve his skills. Pro Tip 2/3Often Positive When describing effort or pursuit, 'relentless' can suggest admirable commitment. Her relentless pursuit of justice inspired everyone. Pro Tip 3/3Not Easily Stopped Use 'relentless' to describe someone or something that doesn't give up easily. The relentless wind continued for days.