Translation of "unyieldiness" into Russian

(quite informal) Not sure if it would be manageable or too clunky for my son. He does play upright bass but it's more the unyieldiness (is that a word?) of some I have played that concerns me. - https://www.talkbass.com/threads/looking-for-a-short-scale-acoustic-for-600-or-less.1230120/