negligent

Example:She was careless in her calculations, which led to a significant error.

Definition:done or said without proper thought, attention, or concern.

Example:He was criticized for being remiss in his duties as a manager.

Definition:neglectful or inattentive, especially towards a duty or responsibility.

Example:The work is done in a slipshod manner, with obvious sloppiness.

Definition:inelegant or careless in manner or appearance.