Ecstasize is a rare verb that means to undergo or experience ecstasy or intense happiness. The antonyms for this word would be those that describe opposite emotions or states of mind, such as gloom, depression, sadness, disappointment, discontent, and despair. Some other antonyms of ecstasize include calm, boredom, apathy, indifference, detachment, and disinterest. These words represent a range of negative emotions that a person may feel when they are not experiencing ecstasy. While ecstasize brings an extremely positive feeling, its antonyms define a broad spectrum of negative emotional states.