The antonyms for the phrase "most lapsing" include "least expiring," "most enduring," "least deteriorating," "most stable," "least perishing," and "least temporary." These antonyms have opposite meanings, implying that the subject matter will not expire, deteriorate, or collapse anytime soon. Instead, it persists, maintains its quality and stability, and remains valuable for the long term. These antonyms help in providing an idea of the opposite of most lapsing, which often means something that is temporary, fleeting, or short-lived. Hence, it is necessary to identify the right antonyms to convey the correct meaning in a given context.