Sparest means the least or minimum amount of something. Synonyms for sparest could include the words fewest, minimum, least, and slightest. Fewest refers to a small number or amount. Minimum refers to the lowest possible level or amount required. Least refers to the smallest possible quantity or degree. Slightest means the smallest amount or degree possible. Other synonyms for sparest could include the words humblest, skinniest, barest, and thinnest. These words refer to something being less than average or the minimum requirement. In general, synonyms for sparest are words that describe something being limited or scant.