The term "undercharges" can be expressed with multiple synonyms. Some of the possible words that could be used instead of undercharges include underpricing, undervaluing, underbilling, mispricing, and underestimation. Each of these words has a slightly different connotation, but they all refer to charging or pricing something too low. Underpricing suggests that the item or service is being sold for less than its true value. Undervaluing implies that something is not being appreciated enough for what it is worth. Underbilling means that someone is not being charged the full amount they should be paying. Mispricing indicates that there is a mistake in how something has been priced. Lastly, underestimation means that the value of something has not been properly assessed.