The phrase "thick as thieves" is often used to describe a close and trustworthy relationship between two individuals. However, there are many antonyms that can be used to describe the opposite type of relationship. Words such as "distant," "estranged," "opposed," "disconnected," "divisive," and "opposing" all suggest a lack of unity and mutual trust between individuals. These antonyms can be used to describe relationships that are characterized by distrust, rivalry, and distance. Whereas the phrase "thick as thieves" represents a strong bond between people, its antonyms highlight the opposite - relationships that lack mutual support and trust.