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Definition of clueless adjective from the Oxford Advanced Learner's Dictionary

clueless

adjective
 
/ˈkluːləs/
 
/ˈkluːləs/
(informal, disapproving)
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  1. very stupid; not able to understand or to do something
    • I'm completely clueless about computers.
    • Henry was a young and very clueless officer.
See clueless in the Oxford Advanced American Dictionary
ripple effect
noun
 
 
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