The term "back slapping" generally implies insincere praise or flattery. Antonyms for this term encompass a range of more genuine, meaningful expressions of encouragement or acknowledgement. Rather than simply slapping someone on the back, one might offer sincere congratulations, genuine praise, or specific feedback that takes note of an individual's specific accomplishments or strengths. Other antonyms for back slapping might include thoughtful acknowledgement, appreciation, or gratitude. Ultimately, the goal is to move beyond surface-level compliments and to offer more meaningful recognition that truly celebrates someone's achievements or efforts.