Antonyms for the phrase "following in sequence" include disordered, random, unsystematic, haphazard, and chaotic. These terms describe a lack of order, structure or pattern, making it difficult to track or anticipate what comes next. Disordered refers to something that is messy, confusing, and difficult to organize, while random implies a lack of direction or purposeful arrangement. Unsystematic refers to a lack of a clear system or methodology, while haphazard suggests reckless or careless organization. Finally, chaotic describes a state of complete confusion or disorder where even predictions or expectations are impossible to make.