The term "sundry items" refers to a collection of various unrelated things. Antonyms for this term would include more specific descriptors such as singular, uniform, or homogeneous. If the items in question are all the same type or are part of a set, words like consistent, identical, or standardized could be used. Conversely, if the items are completely different from each other, antonyms like distinct, unique, or individual would be more fitting. Another antonym could be "organized" as opposed to "sundry," indicating that the items are arranged or grouped in an orderly fashion rather than a jumbled assortment.