The word "glibbest" is spelled with a double "b" to indicate a short, voiced consonant sound. Its IPA phonetic transcription is /ˈɡlɪb.ɛst/. The first syllable starts with a voiced velar stop /ɡ/, followed by a voiced alveolar lateral approximant /l/. The second syllable starts with a short vowel sound /ɪ/, followed by a voiced bilabial stop /b/. The final syllable has the suffix "-est," indicating the highest degree of the adjective "glib."