What adjective describes something that is difficult to handle due to its weight or bulk?

The adjective "cumbersome" accurately describes something that is difficult to handle due to its weight or bulk. This term is commonly used in contexts where objects or tasks are not only physically heavy or unwieldy but also awkward to manage, leading to inconvenience or inefficiency. For instance, one might refer to a bulky piece of furniture or a large package as cumbersome, highlighting the challenges of maneuvering these items in limited spaces.

On the other hand, "copious" refers to a large quantity of something, often related to abundance rather than difficulty of handling. "Curtailed" implies something has been reduced or limited, which is unrelated to weight or bulk. Lastly, "cordial" describes a warm and friendly manner, which does not connect to the concept of handling physical weight or size. Thus, "cumbersome" is the term that best encompasses the idea of difficulty due to heaviness or bulkiness.