Antonyms for the phrase "particular activity adeptnesses" refer to the lack of skill or proficiency in performing a specific task. Words that may serve as antonyms for "particular activity adeptnesses" include incompetence, ineptitude, incapacity, insufficiency, clumsiness, and inadequacy. These antonyms suggest a lack of proficiency or capability in performing a particular activity, which may require improvement or training. Alternatively, antonyms may convey a general lack of interest or motivation in developing particular activity adeptnesses, which could include disinterest, apathy, or indifference. By considering antonyms for "particular activity adeptnesses," individuals can better understand their strengths and identify areas for improvement in their skill sets.