Antonyms for the phrase "has the earmarks of" could include "unlikely," "atypical," "unremarkable," "uncharacteristic," or "deviating." When something has the earmarks of something else, it typically means that it has characteristics or attributes that suggest a particular quality, trait, or outcome. Thus, an antonym for this phrase would convey the opposite meaning, suggesting that something lacks the expected qualities, is unexceptional, or does not follow the expected pattern. In general, it is important to consider the context in which the phrase "has the earmarks of" is used to identify the most appropriate antonym.