Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
unargumentative is an adjective meaning "not given to or characterized by argument". It carries one recorded sense.
not given to or characterized by argument
Definitions, synonyms and semantic relations for unargumentative come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.