The Collaborative International Dictionary of English v.0.48:
Wieldy \Wield"y\, a. Capable of being wielded; manageable; wieldable; -- opposed to unwieldy. [R.] --Johnson. [1913 Webster]WordNet (r) 3.0 (2006):
wieldy adj 1: easy to handle or use or manage; "a large but wieldy book" [ant: unmanageable, unwieldy]