The term "more unadvisable" refers to something that is even more unwise or risky than something else. Therefore, its antonyms would be "advisable," "wise," "prudent," "sensible," "judicious," "safe," "cautious," "responsible," "sound," and "thoughtful." These words imply that the action or decision being made is reasonable, beneficial, and intelligent. The use of such words can be helpful in guiding people towards making wise decisions, particularly in situations where caution is advised. In contrast, the use of words synonymous to "more unadvisable" can signify danger or foolishness, serving as a warning to those who may be considering making such decisions.