Fromastonish +‎-able.

astonishable (comparativemoreastonishable,superlativemostastonishable)

1. (obsolete)Astonishing.
2. Susceptible to beingastonished;shockable.
   • 2007 January 21, Joe Queenan, “Astonish Me”, inNew York Times‎^[1]:

     These are good times for theastonishable reading public.

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