Definition of mouth-breather in English:

mouth-breather

Syllabification: mouth-breath·er
Pronunciation: /ˈmouTHˌ brēT͟Hər
 
/

noun

informal
A stupid person.
More example sentences
  • Meanwhile, down in the sewer, the mouth-breathers are already calling for them to be prosecuted for terrorism.
  • I was almost trampled by a herd of mouth-breathers, apparently in the grip of some kind of snack frenzy!
  • Forget all the mouth breathers in the audience, how do I feel about the record.

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Word of the day grammarian
Pronunciation: grəˈme(ə)rēən
noun
a person who studies and writes about grammar