Ho-hum is an expression used to indicate boredom or lack of interest, and therefore we can look for antonyms that suggest excitement, enthusiasm or interest. Some antonyms for ho-hum could be thrilling, stimulating, fascinating, captivating, engrossing, or mesmerizing. These words convey a sense of energy and engagement that contrast with the flatness and disinterest of ho-hum. Other antonyms could include vibrant, dynamic, animated, or lively, highlighting the contrast between a dull and uneventful experience and an exciting and engaging one. Overall, antonyms for ho-hum are words that inspire interest, attention, and excitement, and that turn a dull moment into a lively one.