"On the numbers" is an expression that is often used to indicate that something is precise, accurate, and methodical. However, when looking for antonyms, we could use words like random, disorganized, or chaotic. These antonyms imply that there is no clear structure or pattern, and that the results or outcomes are uncertain or unpredictable. Another antonym could be subjective, which means that opinions or feelings are involved, and that there is no objective measurement or standard to rely on. Finally, we could use the antonym arbitrary, which suggests that the decisions or actions are based on personal preference or whim rather than any rational criteria.