There are many synonyms for the phrase "was captivated by." Some examples include "was entranced by," "was spellbound by," "was mesmerized by," and "was enchanted by." These phrases all convey a strong sense of fascination and absorption, indicating that someone was wholly taken in by something they saw, heard, or experienced. Other words with similar connotations include "enthralled," "charmed," and "transported," each of which speaks to the power of a particular moment or experience to capture someone's attention and emotions. Whatever the specific phrasing, the underlying message is clear: something or someone has made a lasting impression, leaving a sense of wonder and awe in its wake.