Definition of 404 adjective from the Oxford Advanced American Dictionary

 

404

 adjective
adjective
NAmE//ˌfɔr oʊ ˈfɔr//
 
 
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used to describe someone or something that is missing or not very intelligent My keys are 404. Don't ask Tom how to fix it—he's 404. From the number that appears when something cannot be found on the Internet.