The Vietnamese word "bất diệt" is an adjective that translates to "indefectible," "everlasting," or "undying" in English. It is used to describe something that cannot be destroyed, that lasts forever, or that remains unchanged despite challenges.
While "bất diệt" generally conveys a sense of permanence or endurance, context is important. It can also describe ideas or emotions that persist through time, such as historical events that have a lasting impact.