Incautious (adjective)

1. Not cautious or not careful.
2. Not prudent or not showing good judgement.

Origin:

This word is derived from the latin word "incautus" which is formed by the combination of the prefix "in-" meaning "not" and the word "cautus" meaning "cautious" or "prudent".

Examples:

1. He was criticized for his incautious driving and causing an accident.
2. The explorer was incautious and got lost in the jungle.
3. She was incautious and revealed too much personal information online.
4. The company was incautious and invested all their money in a risky venture.
5. He was incautious and did not take proper safety precautions while working.