unwieldy
un-wield-y
adjective
Difficult to move or handle because of its size, shape, or weight.
"The large box was unwieldy to lift."
Thesaurus
Synonyms: bunglesome, awkward, ungainly, unmanageable, cumbersome, cumbrous, clumsy, impractical, clunky, gawky
Antonyms: wieldy