The antonyms of the word "most garbage" could be "least valuable," "cleanest," or "most useful." While most garbage is seen as waste, these antonyms showcase the opposite end of the spectrum. Least valuable refers to items that have low monetary or sentimental value. Cleanest is a term that highlights the cleanliness of objects, emphasizing that they are free from dirt or debris. Meanwhile, most useful points to the practicality of objects, indicating that these items are helpful and serve a purpose. Overall, these antonyms provide a contrasting view of the negative connotations associated with the word "garbage.