The concept of "remained alive" describes someone or something that has endured and survived. However, the antonyms for this phrase convey a very different meaning. Terms like "perished," "died," or "passed away" all convey the idea of death, decay, or extinction. If someone or something did not "remain alive," it means they have ceased to exist, and their presence is gone. Other antonyms might include words that denote absence or emptiness, such as "vanished" or "disappeared." Overall, the antonyms for "remained alive" portray a sense of loss and finality, highlighting the fragile nature of life and the ultimate fate we all share.