carelessness
Definitions
Failure to give sufficient attention or thought to avoiding harm or errors.
Lack of concern or interest; indifference.
Examples
The accident was caused by the driver's sheer carelessness.
His carelessness with important documents led to a significant loss for the company.
Synonyms
negligence heedlessness thoughtlessness laxity inattention recklessness slapdash
Antonyms
carefulness diligence attentiveness meticulousness caution precision thoroughness