Webster's Revised Unabridged Dictionary · 1913

Impressionable

Impressionable , adjective

[Compare French impressionnable.]

Liable or subject to impression; capable of being molded; susceptible; impressible; as, a bad influence on impressionable youths.
He was too impressionable; he had too much of the temperament of genius. — Motley
A pretty face and an impressionable disposition. — T. Hook