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English definition of “mouth-breather”

mouth-breather

noun [C] uk   /ˈmaʊθˌbriː.ðər/ us    /-ðɚ/ US informal
a stupid personStupid and silly people
mouth-breathing
adjective uk   /ˈmaʊθˌbriː.ðɪŋ/ informal us  
stupid: a mouth-breathing idiotStupid and silly behaviour
(Definition of mouth-breather from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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