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Adjective: witless  wit-lus
  1. (of especially persons) lacking sense, understanding or judgment
    "His witless remarks made everyone in the room cringe";
    - nitwitted [informal], senseless, soft-witted
     
  2. Bewildered or confused, especially due to shock or fear
    "He stood there witless, unable to comprehend the terrible news"; "scared witless"

See also: daft [Brit, informal], dumb, foolish, imbecile, imbecilic, stupid

Encyclopedia: Witless