Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
incautious is an adjective meaning "lacking in caution". It carries 2 recorded senses.
carelessly failing to exercise proper caution
“an incautious step sent her headlong down the stairs”
Definitions, synonyms and semantic relations for incautious come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.