Impressionable means easily influenced by other people's ideas, opinions, or behaviors. When someone is impressionable, they tend to absorb and adopt whatever they see or hear around them, like a sponge soaking up water.

Younger children are often more impressionable than older ones because they're still figuring out what they believe and how the world works. A first-grader might start using the same catchphrases as their favorite TV character, or suddenly want to dress exactly like their older sibling. That's being impressionable: taking in influences from the outside and making them part of yourself.

The word usually describes someone who hasn't yet developed strong independent judgment. An impressionable middle schooler might try out different interests, styles, or attitudes as they discover who they are. This isn't necessarily bad; exploring different ideas helps you figure out what truly matters to you. But it does mean being careful about influences, since impressionable people can pick up harmful habits or mistaken beliefs just as easily as helpful ones.

Adults use the word most often when they're concerned about negative influences: “That movie isn't appropriate for impressionable viewers.” As people mature and develop solid values and critical thinking skills, they usually become less impressionable and better able to evaluate ideas independently rather than simply accepting them.