1. the quality or state of being incautious; lack of caution or care; recklessness
Usage: uncountable noun; formal register

Examples

• His incautiousness in handling the fragile equipment resulted in costly damage.
• The driver's incautiousness on the icy road nearly caused an accident.
• She regretted her incautiousness in sharing personal information with a stranger.
• The team's incautiousness during the negotiation weakened their position.
• Financial advisors warn against incautiousness when investing in volatile markets.
• His incautiousness about food allergies put the dinner guests at risk.