"More unmoistened" is an unusual term to find antonyms for, as it's a somewhat uncommon phrasing. However, if you take it to mean "dryer," more straightforward antonyms could include "dampened," "moistened," or "wet." Other possibilities might include "hydration," "humidification," or "drenching." It's worth noting, however, that antonyms for any word can be somewhat subjective - the context in which the word appears, its intended meaning, and the speaker or writer's intended tone can all play a role in what might be considered an appropriate or effective antonym.