dumb blonde noun a stereotypical (perhaps mythical) blonde-haired, sexually attractive woman who is not especially intelligent US,1936
The Essex girl archetype is as dated as the image of Marilyn Monroe, believes [Joanna] Pitman. “We’ve moved from dumb blonde to power blonde, like Hillary Clinton. Now it’s possible to feel empowered as a blonde.” — TheGuardian, 25 September 2001