The word "not burdensome" refers to something that is easy or effortless to handle. Some antonyms for this term are "difficult," "burdensome," "onerous," "taxing," and "demanding." The opposite of an easy task can be a complex or challenging one, which may require much effort or hard work. Similarly, a burden is something that is difficult to carry or manage, often causing stress or anxiety. By contrast, the term "not burdensome" implies something that is light, easy to manage, and does not cause any trouble or discomfort. Therefore, antonyms for this word are those that convey the opposite meaning, suggesting complexity, effort, or difficulty.