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