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Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
treasonable is an adjective meaning "having the character of, or characteristic of, a traitor". It carries one recorded sense.
having the character of, or characteristic of, a traitor
“the faithless Benedict Arnold”
“a lying traitorous insurrectionist”
Definitions, synonyms and semantic relations for treasonable come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.