"Wast mind" is not a commonly used term in modern English. However, it can be understood as a variant of the phrase "waste of mind" which means someone who is unintelligent, foolish, or lacks intellectual ability. The pronunciation of "wast mind" would be /weɪst maɪnd/ with the first sound being a long "a" and the second sound being a pronounced "i." The term may not be found in many dictionaries since it is considered archaic or dialectical.