Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
holier-than-thou is an adjective meaning "excessively or hypocritically pious". It carries one recorded sense.
excessively or hypocritically pious
“a sickening sanctimonious smile”
Definitions, synonyms and semantic relations for holier-than-thou come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.