The antonyms for the phrase "missing boat" include the words "found" and "present." When something is found, it means it has been located or recovered. Conversely, when something is missing it cannot be found, so "found" is the antonym. "Present" means that something is there and not absent, which is the opposite of "missing." Additionally, synonyms for "missing boat" include "lost opportunity," "late," and "out of luck." When an opportunity is lost or passed up, it can't be retrieved, so "taken opportunity" is a suitable synonym. "Early" is the antonym of "late" and "fortunate" is the antonym of "out of luck.