The antonyms for the word "force upon" are gentle, suggestive, optional, and voluntary. Instead of coercing or compelling someone to do something, one can use gentle persuasion, suggesting ideas or options, and allowing freedom of choice. It is important to respect boundaries and opinions of individuals rather than imposing decisions upon them. Tactful communication, active listening, and open-mindedness can aid in achieving a mutual understanding and agreement rather than resorting to forceful tactics. By utilizing these antonyms, one can foster a positive and respectful relationship with others, creating a harmonious environment.