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• a  not sensitive or susceptible to impression
  an unimpressionable mind

• Only one, when Bing Crosby mistakes him for a fan and casually autographs the tortilla that he is holding, does the unimpressionable Cantinflas get a line that is unforgettable.
• Reggie turned out to be unattractive, unimpressionable; when he announced that he was planning to take Holy Orders the sisters wrote him off as a loss.

• impressionable