Tensenesses, a quality of being tense or strained, can have various antonyms depending on the context in which it is used. In a physical sense, the antonyms could be relaxation, calmness or looseness. In an emotional or psychological sense, antonyms include serenity, ease, composure, tranquility, contentment, and happiness. In creative writing, it can be appropriate to use metaphorical antonyms such as laughter or peacefulness. The word tensenesses can also be substituted with 'tension' and the subsequent antonyms would be similar. Antonyms for tensenesses depend on the context of use and the specific word being replaced.