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