impressionable(a = adj.all) impressible, waxy - easily impressed or influenced; "an impressionable youngster"; "an impressionable age"; "a waxy mind"
Antonym: unimpressionable

   Liable or subject to impression; capable of being molded; susceptible; impressible; as, a bad influence on impressionable youths. [1913 Webster]
"He was too impressionable; he had too much of the temperament of genius." [1913 Webster]
"A pretty face and an impressionable disposition." [1913 Webster]

impressionable, adj. easily influenced; susceptible to impressions.

Derivative:
impressionability n. impressionably adv.

Etymology:
F impressionnable f. impressionner (as IMPRESSION)

N  sensibility, sensibleness, sensitiveness, moral sensibility, impressibility, affectibility, susceptibleness, susceptibility, susceptivity, mobility, vivacity, vivaciousness, tenderness, softness, sentimental, sentimentality, sentimentalism, excitability, fastidiousness, physical sensibility, sore point, sore place, where the shoe pinches, sensible, sensitive, impressible, impressionable, susceptive, susceptible, alive to, impassionable, gushing, warm hearted, tender hearted, soft hearted, tender as a chicken, soft, sentimental, romantic, enthusiastic, highflying, spirited, mettlesome, vivacious, lively, expressive, mobile, tremblingly alive, excitable, oversensitive, without skin, thin-skinned, fastidious, sensibly, to the quick, to the inmost core, mens aequa in arduis, pour salt in the wound.