The antonyms for the word "well-groomed" are numerous and varied. A few of the most common antonyms include unkempt, disheveled, messy, slovenly, and scruffy. Unkempt implies a lack of attention to personal appearance, while disheveled suggests that one has been in a state of disarray for some time. Messy conveys a sense of disorder, and slovenly implies a disregard for neatness and cleanliness in appearance. Scruffy, on the other hand, suggests a rough or unkempt appearance that may be deliberate or unintentional. In contrast to the well-groomed person, these antonyms all suggest a lack of attention or care in one's personal appearance.