There are a few different antonyms for the word "most lightfooted." Some of the most common ones might include words like "clumsy," "awkward," or "heavy-footed." These are all words that imply a lack of grace or coordination, making them the opposite of a lightfooted person who moves with ease and fluidity. Other antonyms might include words like "uncoordinated," "twitchy," or "jerky," all of which suggest a lack of control over one's movements. Ultimately, the antonyms for "most lightfooted" all point to a sense of clumsiness or awkwardness, which is the opposite of the grace and agility that come with being lightfooted.