The antonyms for the phrase "in rapport" are harder to define because it is an idiomatic expression that refers to a positive and harmonious relationship between two individuals or groups. However, some antonyms include "out of sync", "at odds", "incongruous", "unrelated", "discordant", and "unconnected". These words imply a lack of harmony, understanding, or agreement between two parties. When two individuals are not "in rapport", communication can be difficult, and misunderstandings are common. Therefore, it is important to identify and avoid situations where a lack of rapport prevails, and instead prioritize building positive and collaborative relationships with others.