Impressionable

google

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mid 19th century: from French, from impressionner, from Latin impressio(n- ), from the verb imprimere ‘press into’ (see imprint).

wiktionary

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From French impressionnable. See also impressible.

etymonline

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impressionable (adj.)

"susceptible to (mental) impressions," 1827, from French impressionable (earliest English examples are in French translations and settings); see impression + -able. Related: Impressionability (1831). Earlier was impressible (1620s).