Unwieldy means difficult to manage or carry because of size, shape or weight.
Unwieldy comes under adjective
Synonyms: awkward, bulky, clumsy, cumbersome, inconvenient, ungainly.
Antonyms: convenient, handy, manageable.
If the fund continues to grow at the same rate, it will become unwieldy.
It took three-hours to move the unwieldy piano up the stairs.
The large size of the department has made it unwieldy; I suggest we divide it into two more manageable groups.