half witted

/ˈhæfˌwɪtɪd/
adjective
  1. Stupid or foolish; lacking intelligence or common sense.
    • Only a half-witted person would try to cross the street without looking.
    • She called the movie's plot half-witted and predictable.
    • His half-witted plan to build a raft out of cardboard quickly fell apart.
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