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Hard to handle or control due to the size or weight of the item
"Unwieldy" means "unwieldy"--it's not an uncommon word in modern English. It means awkward or clumsy.
A snow shovel is very unwieldy for use in the garden.
I can give you several sentences.
Sometimes a sledgehammer is just too unwieldy to use indoors.
The twelve-inch left-handed monkey wrench is an unwieldy but useful tool.
The earliest revolvers were heavy and unwieldy weapons.