Fragmentalize means to break up or divide something into fragments, often resulting in a loss of coherence or completeness. The antonyms of fragmentalize would involve the act of putting together or integrating parts into a whole. Some possible antonyms for fragmentalize could include unify, consolidate, combine, integrate, amalgamate, synthesize, or coalesce. These words suggest the act of creating a cohesive or unified entity, rather than breaking it down into separate parts. By using these antonyms, one could express the idea of bringing together disparate elements to create a more cohesive whole, rather than breaking something apart into smaller, disconnected pieces.