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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.
suppositious is an adjective meaning "based primarily on surmise rather than adequate evidence". It carries one recorded sense.
based primarily on surmise rather than adequate evidence
“theories about the extinction of dinosaurs are still highly conjectural”
“the supposed reason for his absence”
“suppositious reconstructions of dead languages”
“hypothetical situation”
Definitions, synonyms and semantic relations for suppositious come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.