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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.
portentously is an adverb meaning "in a portentous manner". It carries one recorded sense.
in a portentous manner
“portentously, the engines began to roll”
Definitions, synonyms and semantic relations for portentously come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.
147,478 entries in AltF Lexicon, every one with its syllables marked.
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