Most fitfully means irregularly or sporadically and there are several synonyms for it. One common synonym is erratically, which means having no fixed course or direction. Another synonym is inconstantly, which means not consistent or steady in behavior or quality. Additionally, spasmodically is another synonym that means occurring or done in brief, irregular bursts. Unevenly is another word that can be used as a synonym for most fitfully. It suggests a lack of consistency or regularity in a pattern or movement. Furthermore, irregularly, intermittently, and fitfully are also synonyms for most fitfully, all suggesting an absence of consistency or continuity.