The word "most unmerited" indicates something that is completely undeserved. Some possible antonyms for this phrase could include "well-deserved," "justified," "earned," or "deserved." Another possible antonym could be "worthy," indicating that the thing in question is deserving of praise or recognition. Alternatively, one could use "valid" or "legitimate," suggesting that the thing in question is founded in reality and supported by evidence. "Fair," "equitable," and "reasonable" could also be used as antonyms, indicating that the thing in question is in line with expectations or standards. Ultimately, the use of antonyms depends on the context and intended meaning of the phrase "most unmerited.