Easily influenced or affected by experiences, opinions, or suggestions, especially someone young who hasn't developed strong independent opinions yet.
From 'impression' (a mark or effect made on someone's mind) plus '-able' (capable of being). The word emerged in the 1700s as psychology developed language to describe how minds form beliefs.
Developmental psychologists discovered that humans are most impressionable around ages 2-7 and again during adolescence—these 'critical periods' shape personality more than any other time! This is why teachers and parents have such huge influence during these windows.
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