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Adjective: witless  wit-lus
  1. (used as complement) to the utmost degree
    "he was scared witless";
  2. (of especially persons) lacking sense, understanding or judgment
    "The human race is probably best characterized as being that species that has the proclivity to play witless pranks on one another";
    - nitwitted, senseless, soft-witted

See also: intense, stupid

Encyclopedia: Witless