The Collaborative International Dictionary of English v.0.48:

akinesic \ak`i*ne"sic \ ([=a]`k[i^]*n[=e]"s[i^]k or
   [a^]k`[i^]*n[=e]"s[i^]k), akinetic \a*ki`net"ic\
   ([=a]`k[i^]*n[e^]t"[i^]k), a. (Med.)
   Of or pertaining to akinesia.
   [1913 Webster + AS]