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witless

adjective
 
 
/ˈwɪt.ləs/ disapproving

Definition

stupid or showing no intelligence: The novel centres around a witless father who is continually being conned by his three children. → See also witStupid and sillyOf unsound mind scare/frighten sb witless to frighten someone very much: I was scared witless the last time Tina drove me down to London.Frightening and scaring
(Definition of witless adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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