"Propositive" is a useful word that describes something that is forward-thinking and proactive, but it isn't always the easiest word to use in everyday conversation. If you're looking for some synonyms for "propositive," you might consider using words like "affirmative," "assertive," or "constructive." These words all convey a sense of positive action and confidence in moving forward. Other synonyms for "propositive" might include "encouraging," "proactive," and "optimistic." Whichever synonym you choose to use, the most important thing is to communicate a clear and positive message that inspires others to take action and move forward in a productive way.