Source : Webster's Revised Unabridged Dictionary (1913)

Impresionable \Im*pres"ion*a*ble\, a. [Cf. F. impressionnable.]
   Liable or subject to impression; capable of being molded;
   susceptible; impressible.

         He was too impressionable; he had too much of the
         temperament of genius.                   --Motley.

         A pretty face and an impressionable disposition. --T.
                                                  Hook.