The Collaborative International Dictionary of English v.0.48:

Autoschediastic \Au`to*sche`di*as"tic\
   ([add]`t[-o]*sk[=e]`d[i^]*[a^]s"t[i^]k), Autoschediastical
\Au`to*sche`di*as"tic*al\ (-[a^]s"t[i^]*kal), a. [Auto- + Gr.
   schedia`zein to do hastily. See Schediasm.]
   Extemporary; offhand. [R.] --Dean Martin.
   [1913 Webster]