As "humidnesses" refers to the state of being humid or damp, antonyms for this word would include terms for dryness or aridity. Some possible options might include "dryness," "aridity," "desiccation," "parchedness," "barrenness," or "dehydration." Depending on the context in which the word is being used, other potential antonyms might include words that describe a lack of moisture or water, such as "thirst," "drought," or "deficiency." Ultimately, when seeking antonyms for "humidnesses," it is important to consider the opposite conditions that might be most relevant to the context or situation being described.