From The Collaborative International Dictionary of English v.0.44 [gcide]:
Impressionable \Im*pres"sion*a*ble\, adjective [Cf. F. impressionnable.] Liable or subject to impression; capable of being molded; susceptible; impressible; as, a bad influence on impressionable youths.
From WordNet (r) 2.0 [wn]:
From Moby Thesaurus II by Grady Ward, 1.0 [moby-thes]:
91 Moby Thesaurus words for "impressionable": accessible, adaptable, alive to, amenable, apt, aware, bendable, bending, bright, clever, cognizant, compliant, conscious, delicate, docile, ductile, educable, elastic, emotionable, extensible, extensile, fabricable, facile, fictile, flexible, flexile, flexuous, formable, formative, giving, impressible, impressive, influenceable, instructable, intelligent, like putty, limber, lissome, lithe, lithesome, malleable, moldable, motivated, movable, open, open-minded, passible, perceptive, persuadable, persuasible, pervious, plastic, pliable, pliant, quick, ready, receptive, responsive, ripe for instruction, schoolable, sensible, sensile, sensitive, sensitive to, sentient, sequacious, shapable, soft, softhearted, springy, suasible, submissive, suggestible, supple, susceptible, susceptive, swayable, sympathetic, teachable, tender, tenderhearted, thirsty for knowledge, tractable, tractile, trainable, warmhearted, weak, whippy, willing, willowy, yielding
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