The word "over-shadows" refers to a situation where one thing or person dominates or outshines another. The antonyms for "over-shadows" include "underwhelm," "underperform," "underwhelm," "underachieve," and "underachieve." These words denote a lack of dominance or impact, where something fails to measure up to expectations or is overshadowed by another. In contrast to "over-shadows," these antonyms express a sense of mediocrity or failure to stand out. Therefore, when seeking to describe a scenario where one thing does not outshine another, alternative words that may be used include "underwhelms," "falls short," "lacks impact," and "fails to impress.