In-advisable is a term that describes something that is not recommended or wise to do. The opposite of in-advisable would be advisable or wise. These words indicate that something is considered suitable or appropriate to do. Practical, judicious, sensible, and careful are other words that could be used as antonyms for in-advisable. Something that is advisable or wise is likely to result in a desirable and positive outcome. Therefore, when making a decision or taking an action, it is always best to consider its advisability, ensuring that it is practical, sensible, and in line with one's goals and values.