unwieldy

(a) 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
unmanageable,
(s) difficult to work or manipulate
- unwieldy rules and regulations
(s) lacking grace in movement or posture
- a gawky lad with long ungainly legs
- clumsy fingers
- what an ungainly creature a giraffe is
- heaved his unwieldy figure out of his chair
clumsy, clunky, gawky, ungainly,

unmanageable clumsy clunky gawky ungainly

wieldy