The phrase "doest the sly" is not a word, but rather a combination of words that do not have a clear antonym. Each word may have multiple meanings, making it difficult to find an antonym that matches the context. "Doest" is an archaic form of "do," which means to perform an action. "Sly" means cunning, deceptive, or sneaky. An antonym for "sly" could be straightforward, honest, or transparent. However, it is challenging to find a direct antonym for "doest the sly" without clarifying the intended meaning. In general, it is best to define terms and ensure clarity before searching for antonyms.