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Definition of mouthbreather

mouthbreather

/ˈmaʊθˌbriːðər/
mouth · breath · er
Plural:mouthbreathers
•
Adjective:mouthbreathing
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mouthbreather Lexical Profile

mouthbreather Game Scores & Validity

• noun

1

(Slang, derogatory) A stupid, unintelligent, or socially obtuse person.

Example

"The online forum was quickly overrun by trolls and mouthbreathers who refused to read the article before commenting."

2

A person who habitually breathes through the mouth rather than the nose, often due to chronic nasal congestion or anatomical obstruction.

Example

"The orthodontist noted that the child was a chronic mouthbreather due to enlarged adenoids."

Synonyms
View all synonyms for mouthbreather
Antonyms
View all antonyms for mouthbreather

Word Nuance & Usage

While used literally in medical and dental contexts to describe habitual oral respiration, in everyday speech "mouthbreather" is almost always a derogatory slang insult implying dullness or stupidity.

• Nearby Words

mousse
mousy
mouth
mouthbreather
mouthfeel
mouthful
mouthguard

Cite this Entry

Wordmom. (2026). Definition of Mouthbreather. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/mouthbreather
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