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Syllable division and stress derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
treasonably is an adverb meaning "in a disloyal and faithless manner". It carries one recorded sense.
in a disloyal and faithless manner
“he behaved treacherously”
“his wife played him false”
Definitions, synonyms and semantic relations for treasonably come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.