How would you describe an object that is large or heavy and difficult to carry?

The term "cumbersome" accurately describes an object that is not only large or heavy but also difficult to manage or carry. This word conveys the idea that the object's size and weight create challenges, making it unwieldy. For example, a cumbersome piece of furniture can be hard to maneuver through doorways or transport, reflecting the difficulty associated with its heft and bulk.

In contrast, "bulky" also refers to large or heavy objects but does not inherently imply difficulty in carrying. An object described as bulky may be big and awkward but not necessarily challenging to lift or move. Other options like "lightweight" and "portable" describe objects that are easy to carry or manage, which contradicts the concept of being difficult to handle. Thus, "cumbersome" is the most fitting choice as it encapsulates both the size and the challenge associated with moving the object.