Antonyms for the term "life-sustaining" refer to things that are harmful, damaging, or lethal to living beings. Examples of such antonyms include words like deadly, harmful, poisonous, injurious, and detrimental. These words describe substances, conditions, or actions that threaten or diminish life, rather than sustaining it. For instance, toxic chemicals, polluted air, and polluted water are all antonyms to life-sustaining. Similarly, acts of violence or neglect can also have antonyms for the term "life-sustaining." These antonyms are important in highlighting the various factors that threaten the well-being of living organisms and the need to safeguard life-sustaining resources.