Un-wearying refers to something that is constant and does not tire out. The antonyms of un-wearying are words that signify the opposite, meaning that something is not continuous and can cause exhaustion. Words such as tiring, exhausting, draining, and wearing are antonyms for un-wearying. These adjectives describe actions or situations that are depleting, strenuous or wearisome, and require considerable effort. On the other hand, un-wearying is synonymous with words such as tireless, continuous, and persistent. Therefore, when describing an activity or behavior, consider using an antonym for the word un-wearying, to communicate the opposite meaning.