impressionable

Even decades after enduring an epidemic, the researchers found, the experience during those impressionable years “significantly reduces trust in scientists and in the benefits of their work.”

People have always been able to see the funny side of female impressionability.

It increases the general Impressionability, so that all First Impressions must be more vivid than they have ever been before.

Harriet P's impressionability was put to a very useful purpose.