The phrase "most dealt" refers to something that is handled or processed frequently. Some possible synonyms for "most dealt" include "most handled," "most processed," "most managed," "most addressed," "most attended to," "most worked with," and "most navigated." These synonyms suggest that the subject in question is receiving a significant amount of attention or action. For example, in the context of a business, the "most dealt" products might be those that are the most popular or that require the most effort to produce and sell. In personal relationships, the "most dealt" individuals might be those who require the most care and attention.