lacking grace in movement or posture
"a gawky lad with long ungainly legs"
"what an ungainly creature a giraffe is"
"heaved his unwieldy figure out of his chair"
difficult to work or manipulate
"unwieldy rules and regulations"
difficult to use or handle or manage because of size or weight or shape
"we set about towing the unwieldy structure into the shelter"
"almost dropped the unwieldy parcel"