Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
unexpressive is an adjective meaning "deliberately impassive in manner". It carries one recorded sense.
deliberately impassive in manner
“deadpan humor”
“his face remained expressionless as the verdict was read”
Definitions, synonyms and semantic relations for unexpressive come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.