Nonreciprocal means a relationship or interaction that is only one-sided and does not involve mutual exchange or correspondence. The antonyms for nonreciprocal are reciprocal, mutual, give-and-take, and responsive. A reciprocal relationship refers to a mutual exchange of actions or feelings between two parties. A mutual relationship is characterized by the mutual sharing of feelings, actions, or interests. Give-and-take refers to an equal sharing of things, ideas, or feelings between two people or groups. Responsive implies an interactive and mutual relationship between two parties, where both parties respond to each other's needs, demands, or wishes. In conclusion, reciprocal, mutual, give-and-take, and responsive are the antonyms for nonreciprocal.