Lethiferous is an adjective that refers to something that causes death or is deadly. Antonyms for the word lethiferous would be terms that convey health, vitality, and life. Some antonyms for lethiferous could include wholesome, life-giving, healthy, benign, curative, and rejuvenating. These words denote a sense of well-being and an absence of danger or harm. In contrast, lethiferous implies a sense of danger and a threat to life. Antonyms such as therapeutic, nourishing, and beneficial suggest the opposite, promoting life and encouraging growth. Using antonyms for lethiferous can help to provide a more balanced perspective on the topic of death and health, emphasizing the importance of life-giving properties.