Syncs up is a term that refers to two or more things coming together in a coordinated and cohesive manner. The antonyms of "syncs up" would be words and phrases that describe the opposite - things that are not coordinated, aligned, or working together efficiently. Examples of antonyms for "syncs up" could include "out of sync," "uncoordinated," "disjointed," "disorganized," "clashing," "discordant," "chaotic," or "incompatible." These words suggest a lack of harmony or connection between things, whether it be with people, technology, or systems. While "syncs up" suggests a sense of flow and order, its antonyms describe a state of confusion, disharmony, or disarray.