Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
tightlipped 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”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for tightlipped come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.