The word "over-passing" refers to going beyond a certain limit or exceeding something. Its antonyms would be words that indicate staying within limits or falling short of expectations. Some possible antonyms for "over-passing" include "underachieving," "missing the mark," "falling behind," "underperforming," "shortcoming," and "dissatisfying." These words signify a lack or deficiency in achievement, rather than an excess. In a sense, they represent the opposite of over-passing, which implies going above and beyond what is required or expected. Antonyms for over-passing are often used to describe shortcomings or failures in performance, rather than success or achievement.