Undying/ʌnˈdaɪɪŋ/ Definition 1 of 2Pro Tip 1/3Enduring Emotion Use 'undying' to describe emotions that last very long and will not diminish. She confessed her undying respect for her mentor. Pro Tip 2/3Strong Commitment Shows an unchangeable and committed state of mind or intention. The activist spoke of his undying commitment to the cause. Pro Tip 3/3Not Literal Often used figuratively, not meaning literal immortality but rather a strong continuity. Their undying enthusiasm for the project was admirable.