Other forms: cumbrously
Anything cumbrous is large and unwieldy. You might successfully build a huge, bulky desk from lumber you find in the garage, but how are you going to fit the cumbrous thing through your bedroom door?
It's a good idea to take off your cumbrous hockey uniform — pads, helmet, skates — before you get in the car after practice. This adjective has a more commonly-used synonym, cumbersome, but you may find cumbrous to be slightly less long and clumsy. In other words, it's a bit less cumbrous! Both words come from the old-fashioned verb cumber, "to trouble or hinder."