The phrase "totaling up to" indicates the final sum or amount of something. However, there are several antonyms for this phrase, including "less than," "incomplete," "insufficient," and "scant." These antonyms denote a shortfall or a shortage, rather than a complete or full amount.
For example, a project's budget may "total up to" $50,000, but due to unforeseen expenses, it may end up costing "less than" $50,000. Similarly, if a report is "incomplete," it means that the total of all necessary information is lacking. "Insufficient" and "scant" also imply that there is not enough of something, be it resources, time, or supplies.