The word "un-likeliest" implies something that is improbable or not expected. Its antonyms, on the other hand, are words that suggest the opposite or something that is highly probable. Some antonyms for "un-likeliest" include "most likely," "probable," "expected," "predictable," "foreseeable," "anticipatable," and "inevitable." These words showcase that a particular event or outcome is highly plausible, anticipated or expected in a given scenario. They exhibit certainty and confidence in a predicted outcome, unlike the negative connotations that the term "un-likeliest" brings.