The word "in-extinguishable" describes something that cannot be put out, subdued, or ended. The opposite of this term is "extinguishable," which refers to something that can be extinguished, put out, or ended. Other antonyms for in-extinguishable might include temporary, fleeting, impermanent, mortal, and erasable. These words suggest that the object in question is not permanent or unchanging but can be altered or removed entirely. In-extinguishable is a strong term, implying durability and invincibility. Its antonyms, in contrast, convey a sense of impermanence or fragility.