The phrase "most shilly shally" refers to someone who is hesitant, indecisive or uncertain. There are several synonyms for this phrase, which include "dilly-dally," "drag one's feet," "hem and haw," "procrastinate," "prevaricate," and "be on the fence." Each of these synonyms describes a slightly different type of behavior, but they all share the common characteristic of indecision. Whether someone is hesitating to make a decision, stalling for time, or avoiding a commitment altogether, these synonyms capture the essence of the most shilly shally behavior. If you're trying to convey this type of behavior, any of these synonyms would be a great choice.