Thesaurus.com
Dictionary.com

big mouth

ADJECTIVE
obnoxious
Synonyms
STRONGEST
abhorrent annoying disgusting hateful loathsome nasty objectionable reprehensible rotten unpleasant
WEAK
abominable awful beastly detestable disagreeable dislikable displeasing foul gross hateable heel horrid insufferable invidious mean nauseating odious off-color ornery pain in the neck pesky pestiferous pill repellent repugnant revolting sickening stinking
Antonyms
STRONGEST
agreeable decent friendly good great kind lovable moral nice pleasant pleasing welcome wonderful
WEAK
delightful likeable soft

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Ellis Cave.—On the estate of Dr. Ellis, 19 miles north of Fort Payne and 3 miles from Sulphur Springs, are two caves known locally as Big-mouth and Little-mouth.

From Archeological Investigations Bureau of American Ethnology, Bulletin 76 by Fowke, Gerard