Antonyms for the word "most reddish" would be words that have opposite meanings or connotations. These antonyms could include terms like "blue," "green," "yellow," or "white." These colors represent the opposite ends of the spectrum from red, and therefore offer a clear contrast to "most reddish." Other antonyms could include descriptors like "cool," "icy," "wintry," "calm," or "soothing," all of which offer an alternative to the hot, vibrant quality of red. Regardless of the specific antonyms used, the goal is to provide a clear contrast and offer an alternative to the vivid, fiery quality of "most reddish.