The phrase "art of assistance" implies a certain level of skill and finesse when helping others. However, there are several antonyms that can detract from this sense of proficiency. One such antonym is "incompetence," which suggests a lack of ability or readiness to assist. Another antonym is "neglect," indicating a lack of attention or care in helping others. "Obstruction" is another antonym, suggesting a hindrance or obstruction to someone seeking assistance. Finally, "harm" is an antonym that implies the opposite of assistance, indicating that someone's efforts to help have resulted in making things worse. These antonyms demonstrate the importance of skillful and attentive assistance.