Antonyms for "kisses good-bye" could include phrases like "cold farewell," "uncaring parting," or "apathetic goodbye." Other antonyms might be more extreme or negative, such as "hostile farewell," "angry parting," or "hateful goodbye." Some people may choose to simply walk away without saying goodbye at all, for a more indifferent departure. Alternatively, someone may choose to give a much warmer and affectionate goodbye, such as a tight embrace or multiple kisses goodbye. Whatever the specific antonym, the idea is that it is the opposite of a sweet and loving goodbye, and may involve tension, anger, or indifference.