heedlessness

noun
UK /ˈhiːdləsnəs/
US /ˈhiːdləsnəs/

Heedlessness is not paying attention or not being careful.

His heedlessness caused him to leave his backpack on the bus.


OTHER MEANINGS

2. The state of acting without thinking about the results.

The heedlessness of the driver led to a small accident.

3. A lack of concern for warnings or advice.

Her heedlessness of the teacher's warnings got her in trouble.

4. The habit of not noticing important things around you.

Heedlessness made him miss the sign that said the road was closed.