bubblehead

/ˈbʌbəlˌhɛd/
noun
  1. A person who is silly, forgetful, or not very intelligent.
    • That bubblehead tripped over his own shoelaces twice today.
    • He called his friend a bubblehead for forgetting the meeting time.
    • Don't be such a bubblehead; you left your keys in the fridge again.
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Antonyms
What does "bubblehead" mean? | whatsthatwordmean | whatsthatwordmean