The phrase "most sewedup" is an idiomatic expression that typically means something that is secure, settled, or completed. Synonyms for this phrase might include terms like "locked down," "sealed," "finalized," "concluded," "settled," "nailed down," "firmly established," "decided," "determined," or "resolved." Other similar phrases might include "in the bag," "wrapped up," "certain," "assured," "guaranteed," "unquestionable," or "undisputed." Any of these terms could be used in place of "most sewedup" depending on the context and tone of the sentence or conversation.