"Uncautelous" is a word that is not commonly used and may be unfamiliar to many. The spelling of this word can be broken down using IPA phonetic transcription. The first syllable "un-" is pronounced as [ʌn], while the second syllable "cautel-" is pronounced as [kɔːtəl]. The final syllable "-ous" is pronounced as [əs]. Therefore, "uncautelous" is pronounced [ʌn.kɔːtəl.əs]. This word means someone who is not cautious or not careful in their actions or decisions.