Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
closemouthed is an adjective meaning "inclined to secrecy or reticence about divulging information". It carries one recorded sense.
inclined to secrecy or reticence about divulging information
“although they knew her whereabouts her friends kept close about it”
Definitions, synonyms and semantic relations for closemouthed come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.