uncareful

Example:He was careless with his work, leading to many mistakes.

Definition:Lacking care or consideration for consequences; heedless.

Example:The negligent driver did not see the stop sign and crashed into the other car.

Definition:Showing a lack of due care and attention; failing to take necessary or proper precautions.

Example:The heedless child climbed the tree and fell, breaking his arm.

Definition:Not attentive; neglectful; regardless.