Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
glib-tongued is an adjective meaning "artfully persuasive in speech". It carries one recorded sense.
artfully persuasive in speech
“a glib tongue”
“a smooth-tongued hypocrite”
Definitions, synonyms and semantic relations for glib-tongued come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.