The Collaborative International Dictionary of English v.0.48:

Unwieldy \Un*wield"y\, a.
   Not easily wielded or carried; unmanageable; bulky;
   ponderous. "A fat, unwieldy body of fifty-eight years old."
   --Clarendon.
   [1913 Webster] -- Un*wield"i*ly, adv. -- Un*wield"i*ness,
   n.
   [1913 Webster]