How would you describe someone who is careless and untidy in their work?

The term that best fits the description of someone who is careless and untidy in their work is "slovenly." This adjective conveys a sense of negligence and lack of attention to detail, highlighting not just disorder but also a degree of sloppiness. When someone is described as slovenly, it suggests that their work habits are not only disorganized but also generally unkempt or lacking in care.

The other choices present contrasting qualities. Describing someone as disorganized indicates a lack of systematic arrangement; while this can suggest some untidiness, it does not inherently include the carelessness aspect as strongly as slovenly does. Meticulous, on the other hand, signifies great attention to detail and precision, which is the opposite of carelessness and untidiness. Lastly, orderly denotes a structured and neat approach to work, again contrasting the concept of being careless. Thus, "slovenly" uniquely captures the essence of both carelessness and untidiness.