1) Awkward 2) Awkward to carry 3) Bulky 4) Bunglesome 5) Burdensome 6) Clumsy 7) Cumbersome 8) Cumbrous 9) Hard to handle 10) Not wieldy 11) Ungainly 12) Unmanageable 13) Weighty 14) Wielded with difficulty 1) Awkward 2) Bulky 3) Bunglesome 4) Clumsy 5) Clunky 6) Cumbersome 7) Cumbrous 8) Gawky 9) Heavy 10) Klutzy 11) Ungainly 12) Unmanageable 13) Unweldy 
• (a.) Not easily wielded or carried; unmanageable; bulky; ponderous.
[adj] - difficult to use or handle or manage because of size or weight or shape
adjective difficult to work or manipulate; `unwieldy rules and regulations`
not wieldy; wielded with difficulty; not readily handled or managed in use or action, as from size, shape, or weight; awkward; ungainly.
[SAT terms] lacking grace in movement or posture[Wise words] difficult to use or handle because of size or weight