The word "non-onerosity" means the absence of something being burdensome or costly. Antonyms for this word can include words like "expensive," "costly," "burdensome," or "taxing." These words imply that something is difficult or demanding, and that it requires a great deal of effort, resources, or commitment to accomplish. Other antonyms for "non-onerosity" might include words like "light," "easy," "effortless," "inexpensive," or "simple." These words imply that something is not difficult, does not require a great deal of resources or commitment, and is generally uncomplicated or straightforward. When writing, it is important to choose the appropriate antonyms to accurately convey your intended meaning.