Antonyms of adj interpersonal

1 sense of interpersonal

Sense 1
interpersonal -- (occurring among or involving several people; "interpersonal situations in which speech occurs")

INDIRECT (VIA social) -> unsocial -- (not seeking or given to association; being or living without companions; "the unsocial disposition to neglect one's neighbors")

Similarity of adj interpersonal

1 sense of interpersonal

Sense 1
interpersonal -- (occurring among or involving several people; "interpersonal situations in which speech occurs")
       => social (vs. unsocial) -- (living together or enjoying life in communities or organized groups; "a human being is a social animal"; "mature social behavior")