Most unitary refers to a state or entity that is highly centralized and operates as a single unit without much regional autonomy. The antonyms of most unitary are decentralized, disintegrated, fragmented, and divided. A decentralized system is one that gives more power to sub-national entities to make decisions and implement policies. Disintegrated depicts a breakdown of unity or cohesive action, resulting in separate parts that lack a central authority. Fragmented refers to a situation in which a whole is divided into parts, often resulting in lack of coordination and unity. Divided connotes a state of disagreement or conflict, where a group of people have opposing or conflicting interests that make collaboration challenging, if not impossible.