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