The word "fairiest" does not have any direct antonyms since it is not a standard word in the English language. However, the closest related word to "fairiest" is probably "fairest," which means just and unbiased. Antonyms for "fairest" might include words like unjust, biased, and prejudiced. If we broaden the scope to include the more commonly used word "fair," we can consider antonyms such as unfair, unjust, dishonest, and partial. It is essential to understand the context of the sentence and the intended meaning to identify appropriate antonyms for any given word.