Interesting thing, the word "unwieldy."
I can find the word "wield" in the dictionary. It means "to deal with successfully," or "to handle," and even "to exert one's authority."
"Wieldy" is in the dictionary. It means "capable of being wielded."
"Unwieldy" is in the dictionary. It means "not easily handled, managed, or used.
"Unwield" is NOT in the dictionary. I'd think it would be, given the other words, but "unwield" is not there.
We thus cannot say things like "Unwield that wench, you callous knave!" This, in spite of the fact that most wenches are, when accosted by callous knaves, stuggling to escape and quite unwieldy.
Thus endeth my lecture on the English language for today.