cumbersome

heavy, weighty, ponderous, cumbrous, cumbersome mean having great weight. heavy implies that something has greater density or thickness than the average of its kind or class.

• • a heavy child for his age

weighty suggests having actual and not just relative weight.

• • a load of weighty boxes

ponderous implies having great weight because of size and massiveness with resulting great inertia.

• • ponderous elephants in a circus parade

cumbrous and cumbersome imply heaviness and bulkiness that make for difficulty in grasping, moving, carrying, or manipulating.

• • wrestled with the cumbrous furniture
• • early cameras were cumbersome and inconvenient